ZyXEL Broadband Security Gateway P-312 User manual

Prestige 312

Broadband Security Gateway

User’s Guide

Version 3.20

November 2000

P312 Broadband Security Gateway

ii Copyright

Prestige 312

Broadband Security Gateway

Copyright

The contents of this publication may not be reproduced in any part or as a whole, transcribed, stored in a

retrieval system, translated into any language, or transmitted in any form or by any means, electronic,

mechanical, magnetic, optical, chemical, photocopying, manual, or otherwise, without the prior written

permission of ZyXEL Communications Corporation.

Disclaimer

ZyXEL does not assume any liability arising out of the application or use of any products, or software

described herein. Neither does it convey any license under its patent rights nor the patent rights of others.

ZyXEL further reserves the right to make changes in any products described herein without notice. This

publication is subject to change without notice.

Trademarks

Trademarks mentioned in this publication are used for identification purposes only and may be properties of

their respective owners.

P312 Broadband Security Gateway

FCC Statement iii

Federal Communications Commission (FCC) Interference Statement

This device complies with Part 15 of FCC rules. Operation is subject to the following two conditions:

This device may not cause harmful interference.

This device must accept any interference received, including interference that may cause undesired

operations.

This equipment has been tested and found to comply with the limits for a CLASS B digital device pursuant to

Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful

interference in a commercial environment. This equipment generates, uses, and can radiate radio frequency

energy, and if not installed and used in accordance with the instructions, may cause harmful interference to

radio communications.

If this equipment does cause harmful interference to radio/television reception, which can be determined by

turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of

the following measures:

Reorient or relocate the receiving antenna.

Increase the separation between the equipment and the receiver.

Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

Consult the dealer or an experienced radio/TV technician for help.

Notice 1

Changes or modifications not expressly approved by the party responsible for compliance could void the

user's authority to operate the equipment.

Notice 2

Shielded RS-232 cables are required to be used to ensure compliance with FCC Part 15, and it is the

responsibility of the user to provide and use shielded RS-232 cables.

P312 Broadband Security Gateway

iv

Canadian Users

Information for Canadian Users

The Industry Canada label identifies certified equipment. This certification means that the equipment meets

certain telecommunications network protective, operation, and safety requirements. The Industry Canada

does not guarantee that the equipment will operate to a user's satisfaction.

Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of

the local telecommunications company. The equipment must also be installed using an acceptable method

of connection. In some cases, the company's inside wiring associated with a single line individual service

may be extended by means of a certified connector assembly. The customer should be aware that the

compliance with the above conditions may not prevent degradation of service in some situations.

Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated

by the supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunctions,

may give the telecommunications company cause to request the user to disconnect the equipment.

For their own protection, users should ensure that the electrical ground connections of the power utility,

telephone lines, and internal metallic water pipe system, if present, are connected together. This precaution

may be particularly important in rural areas.

Caution

Users should not attempt to make such connections themselves, but should contact the appropriate

electrical inspection authority, or electrician, as appropriate.

Note

This digital apparatus does not exceed the class A limits for radio noise emissions from digital apparatus set

out in the radio interference regulations of Industry Canada.

P312 Broadband Security Gateway

Warranty

v

Declaration of Conformity

We, the Manufacturer/Importer,

ZyXEL Communications Corp.

No. 6, Innovation Rd. II,

Science-Based Industrial Park,

Hsinchu, Taiwan, 300 R.O.C

declare that the product

Prestige 312

is in conformity with

(reference to the specification under which conformity is declared)

Standard

Standard Item

Version

• EN 55022

Radio disturbance characteristics – Limits and method of

measurement.

1994

• EN 61000-3-2

Disturbance in supply system caused by household appliances

and similar electrical equipment “Harmonics”.

1995

• EN 61000-3-3

Disturbance in supply system caused by household appliances

and similar electrical equipment “Voltage fluctuations”.

1995

• EN 61000-4-2

Electrostatic discharge immunity test – Basic EMC Publication 1995

• EN 61000-4-3

Radiated, radio-frequency, electromagnetic field immunity test 1996

• EN 61000-4-4

Electrical fast transient / burst immunity test - Basic EMC

Publication

1995

• EN 61000-4-5

Surge immunity test 1995

• EN 61000-4-6

Immunity to conducted disturbances, induced by radio-frequency

fields

1996

• EN 61000-4-8

1993

• EN 61000-4-11

Voltage dips, short interruptions and voltage variations immunity

tests

1994

P312 Broadband Security Gateway

vi

CE Doc

P312 Broadband Security Gateway

Warranty

vii

ZyXEL Limited Warranty

ZyXEL warrants to the original end user (purchaser) that this product is free from any defects in materials or

workmanship for a period of up to two years from the date of purchase. During the warranty period, and upon

proof of purchase, should the product have indications of failure due to faulty workmanship and/or materials,

ZyXEL will, at its discretion, repair or replace the defective products or components without charge for either

parts or labor, and to whatever extent it shall deem necessary to restore the product or components to

proper operating condition. Any replacement will consist of a new or re-manufactured functionally equivalent

product of equal value, and will be solely at the discretion of ZyXEL. This warranty shall not apply if the

product is modified, misused, tampered with, damaged by an act of God, or subjected to abnormal working

conditions.

Note

Repair or replacement, as provided under this warranty, is the exclusive remedy of the purchaser. This

warranty is in lieu of all other warranties, express or implied, including any implied warranty of

merchantability or fitness for a particular use or purpose. ZyXEL shall in no event be held liable for indirect or

consequential damages of any kind of character to the purchaser.

To obtain the services of this warranty, contact ZyXEL's Service Center; refer to the separate Warranty Card

for your Return Material Authorization number (RMA). Products must be returned Postage Prepaid. It is

recommended that the unit be insured when shipped. Any returned products without proof of purchase or

those with an out-dated warranty will be repaired or replaced (at the discretion of ZyXEL) and the customer

will be billed for parts and labor. All repaired or replaced products will be shipped by ZyXEL to the

corresponding return address, Postage Paid (USA and territories only). If the customer desires some other

return destination beyond the U.S. borders, the customer shall bear the cost of the return shipment. This

warranty gives you specific legal rights, and you may also have other rights that vary from state to state.

Please register your Prestige (fast, easy online registration at www.zyxel.com) for free

product updates and information.

P312 Broadband Security Gateway

viii

Customer Support

When you contact your customer support representative please have the following information ready:

♦

Prestige Model and serial number.

♦ Information in Menu 24.2.1 –System Information.

♦ Warranty Information.

♦ Date you received your Prestige.

♦ Brief description of the problem and the steps you took to solve it

EMAIL – Support Telephone Web Site

Method

Region

EMAIL – Sales Fax FTP Site

Regular Mail

[email protected]om.tw

support@europe.zyxel.com

+886-3-578-3942 www.zyxel.com

www.europe.zyxel.com

Worldwide

sales@zyxel.com.tw +886-3-578-2439 ftp.europe.zyxel.com

ZyXEL Communications

Corp., 6 Innovation Road II,

Science-Based Industrial

Park, HsinChu, Taiwan.

[email protected]om +1-714-632-0882

800-255-4101

www.zyxel.com

North

America

sales@zyxel.com +1-714-632-0858 ftp.zyxel.com

ZyXEL Communications Inc.,

1650 Miraloma Avenue,

Placentia, CA 92870, U.S.A.

[email protected] +45-3955-0700 www.zyxel.dk

Scandinavia

sales@zyxel.dk +45-3955-0707 ftp.zyxel.dk

ZyXEL Communications A/S,

Columbusvej 5, 2860

Soeborg, Denmark.

[email protected] +43-1-4948677-0

0810-1-ZyXEL

0810-1-99935

www.zyxel.at

Austria

sales@zyxel.at

+43-1-4948678

ftp.zyxel.at

Note: for Austrian users with *.at

domain only!

ZyXEL Communications

Services GmbH.,

Thaliastrasse 125a/2/2/4,

A-1160 Vienna, Austria

[email protected]

+49-2405-6909-0

0180-5213247

Tech Support hotline

0180-5099935

RMA/Repair hotline

www.zyxel.de

Germany

sales@zyxel.de +49-2405-6909-99 ftp.europe.zyxel.com

ZyXEL Deutschland GmbH.,

Adenauerstr. 20/A4, D-52146

Wuerselen, Germany.

P312 Broadband Security Gateway

Table Of Contents ix

Table of Contents

Table of Contents...........................................................................................................................ix

List of Figures ...............................................................................................................................xvi

List Of Tables..............................................................................................................................xxiii

Customer Support.........................................................................................................................viii

Preface.......................................................................................................................................xxvii

Getting Started...................................................................................................................................I

Chapter 1 Getting to Know Your Prestige......................................................................................1-1

1.1 The Prestige 312 Broadband Security Gateway.........................................................................1-1

1.2 Features of The Prestige 312......................................................................................................1-1

1.3 Applications for Prestige 312..................................................................................................... 1-3

1.3.1 Broadband Internet Access via Cable or xDSL Modem.....................................................1-3

Chapter 2 Hardware Installation & Initial Setup.............................................................................2-1

2.1 Front Panel LEDs and Back Panel Ports ....................................................................................2-1

2.1.1 Front Panel LEDs............................................................................................................... 2-1

2.2 Prestige 312 Rear Panel and Connections.................................................................................. 2-2

2.3 Additional Installation Requirements.........................................................................................2-3

2.4 Housing ......................................................................................................................................2-4

2.5 Power Up Your Prestige.............................................................................................................2-4

2.6 Navigating the SMT Interface.................................................................................................... 2-5

2.6.1 Main Menu......................................................................................................................... 2-6

2.6.2 System Management Terminal Interface Summary ...........................................................2-6

2.7 Changing the System Password.................................................................................................. 2-7

2.7.1 Resetting the Prestige......................................................................................................... 2-7

2.8 General Setup.............................................................................................................................2-8

2.8.1 Dynamic DNS .................................................................................................................... 2-8

2.8.2 Configuring Dynamic DNS................................................................................................ 2-9

2.9 WAN Setup .............................................................................................................................. 2-10

2.10 LAN Setup................................................................................................................................ 2-11

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Table Of Contents

2.10.1 LAN Port Filter Setup.......................................................................................................2-12

Chapter 3 Internet Access.............................................................................................................3-1

3.1 TCP/IP and DHCP for LAN .......................................................................................................3-1

3.1.1 Factory LAN Defaults.........................................................................................................3-1

3.1.2 IP Address and Subnet Mask ..............................................................................................3-1

3.1.3 Private IP Addresses ...........................................................................................................3-2

3.1.4 RIP Setup ............................................................................................................................3-2

3.1.5 DHCP Configuration...........................................................................................................3-3

3.1.6 IP Multicast.........................................................................................................................3-3

3.1.7 IP Alias................................................................................................................................3-4

3.2 TCP/IP and DHCP Ethernet Setup..............................................................................................3-4

3.2.1 IP Alias Setup......................................................................................................................3-7

3.3 Internet Access Setup..................................................................................................................3-8

3.3.1 Ethernet Encapsulation........................................................................................................3-8

3.3.2 PPTP Encapsulation............................................................................................................3-9

3.3.3 Configuring the PPTP Client.............................................................................................3-10

3.3.4 PPPoE Encapsulation........................................................................................................3-10

3.4 Basic Setup Complete...............................................................................................................3-12

Advanced Applications ....................................................................................................................II

Chapter 4 Remote Node Setup .....................................................................................................4-1

4.1 Remote Node Profile...................................................................................................................4-1

4.1.1 Ethernet Encapsulation........................................................................................................4-1

4.1.2 PPPoE Encapsulation..........................................................................................................4-3

4.1.3 PPTP Encapsulation............................................................................................................4-4

4.2 Editing TCP/IP Options (with Ethernet Encapsulation)..............................................................4-6

4.2.1 Editing TCP/IP Options (with PPTP Encapsulation)..........................................................4-7

4.2.2 Editing TCP/IP Options (with PPPoE Encapsulation) ........................................................4-9

4.3 Remote Node Filter.....................................................................................................................4-9

Chapter 5 IP Static Route Setup ...................................................................................................5-1

5.1 IP Static Route Setup ..................................................................................................................5-2

Chapter 6

Network Address Translation (NAT) .............................................................................6-1

6.1 Introduction.................................................................................................................................6-1

6.1.1 NAT Definitions..................................................................................................................6-1

6.1.2 What NAT Does..................................................................................................................6-1

6.1.3 How NAT works.................................................................................................................6-2

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Table Of Contents xi

6.1.4 NAT Mapping Types..........................................................................................................6-2

6.1.5 SUA (Single User Account) Versus NAT.......................................................................... 6-3

6.1.6 NAT Application................................................................................................................ 6-4

6.2 SMT Menus................................................................................................................................ 6-4

6.2.1 Applying NAT in the SMT Menus..................................................................................... 6-4

6.2.2 Configuring NAT ............................................................................................................... 6-6

Address Mapping Sets and NAT Server Sets:.................................................................................... 6-6

6.3 NAT Server Sets.......................................................................................................................6-11

6.3.1 Multiple Servers behind NAT .......................................................................................... 6-11

6.3.2 Configuring a Server behind NAT ...................................................................................6-12

6.4 Examples.................................................................................................................................. 6-13

6.4.1 Internet Access Only ........................................................................................................ 6-13

6.4.2 Example 2 – Internet Access with an Inside Server .........................................................6-15

6.4.3 Example 3 – General Case................................................................................................ 6-15

6.4.4 Example 4 –NAT Unfriendly Application Programs....................................................... 6-19

Advanced Management...................................................................................................................III

Chapter 7 Filter Configuration .......................................................................................................7-1

7.1 About Filtering........................................................................................................................... 7-1

7.1.1 The Filter Structure of the Prestige..................................................................................... 7-2

7.2 Configuring a Filter Set.............................................................................................................. 7-4

7.2.1 Filter Rules Summary Menu............................................................................................... 7-6

7.2.2 Configuring a Filter Rule....................................................................................................7-7

7.2.3 TCP/IP Filter Rule..............................................................................................................7-7

7.2.4 Generic Filter Rule........................................................................................................... 7-12

7.3 Example Filter..........................................................................................................................7-14

7.4 Filter Types and NAT............................................................................................................... 7-16

7.5 Firewall.....................................................................................................................................7-17

7.6 Applying a Filter and Factory Defaults.................................................................................... 7-17

7.6.1 LAN traffic....................................................................................................................... 7-17

7.6.2 Remote Node Filters.........................................................................................................7-18

Chapter 8

SNMP Configuration.....................................................................................................8-1

8.1 About SNMP.............................................................................................................................. 8-1

8.2 Configuring SNMP..................................................................................................................... 8-1

Chapter 9

System Information & Diagnosis ..................................................................................9-1

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Table Of Contents

9.1 System Status..............................................................................................................................9-2

9.2 System Information and Console Port Speed..............................................................................9-4

9.2.1 System Information.............................................................................................................9-4

9.2.2 Console Port Speed.............................................................................................................9-5

9.3 Log and Trace.............................................................................................................................9-5

9.3.1 Viewing Error Log..............................................................................................................9-6

9.3.2 UNIX Syslog.......................................................................................................................9-6

9.3.3 Call-Triggering Packet......................................................................................................9-10

9.4 Diagnostic.................................................................................................................................9-10

9.4.1 WAN DHCP .....................................................................................................................9-11

Chapter 10 Transferring Files......................................................................................................10-1

10.1 Filename conventions................................................................................................................10-1

10.1.1 Firmware Development.....................................................................................................10-2

10.2 Backup Configuration...............................................................................................................10-2

10.3 Restore Configuration...............................................................................................................10-3

10.4 Upload Firmware ......................................................................................................................10-3

10.4.1 Uploading the Router Firmware........................................................................................10-3

10.4.2 Uploading Router Configuration File................................................................................10-4

10.5 TFTP File Transfer....................................................................................................................10-5

10.5.1 Example TFTP Command.................................................................................................10-6

10.6 FTP File Transfer......................................................................................................................10-7

10.6.1 Using the FTP command from the DOS Prompt...............................................................10-8

Chapter 11 System Maintenance & Information..........................................................................11-1

11.1 Command Interpreter Mode......................................................................................................11-1

11.2 Call Control Support.................................................................................................................11-2

11.2.1 Budget Management .........................................................................................................11-2

11.2.2 Call History.......................................................................................................................11-3

11.3 Time and Date Setting...............................................................................................................11-4

11.3.1 How often does the Prestige update the time?...................................................................11-4

11.4 Remote Management Setup ......................................................................................................11-6

11.5 Boot Commands........................................................................................................................11-7

Chapter 12 Telnet Configuration and Capabilities .......................................................................12-1

12.1 About Telnet Configuration......................................................................................................12-1

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Table Of Contents xiii

12.2 Telnet Under NAT.................................................................................................................... 12-1

12.3 Telnet Capabilities.................................................................................................................... 12-1

12.3.1 Single Administrator ........................................................................................................12-1

12.3.2 System Timeout................................................................................................................ 12-2

12.4 Telnet Under the Firewall.........................................................................................................12-2

Firewall and Content Filters............................................................................................................IV

Chapter 13 What is a Firewall......................................................................................................13-1

13.1 Types of Firewalls....................................................................................................................13-1

13.1.1 Packet Filtering Firewalls................................................................................................. 13-1

13.1.2 Application-level Firewalls .............................................................................................. 13-1

13.1.3 Stateful Inspection firewalls............................................................................................. 13-2

13.2 Introduction to ZyXEL’s Firewall............................................................................................ 13-2

13.3 Denial of Service...................................................................................................................... 13-3

13.3.1 Basics................................................................................................................................13-3

13.3.2 Types of DoS attacks........................................................................................................13-4

13.4 Stateful Inspection.................................................................................................................... 13-6

13.4.1 Stateful Inspection Process...............................................................................................13-7

13.4.2 Stateful Inspection & the Prestige .................................................................................... 13-8

13.4.3 TCP Security .................................................................................................................... 13-8

13.4.4 UDP/ICMP Security.........................................................................................................13-9

13.4.5 Upper Layer Protocols......................................................................................................13-9

13.5 Guidelines For Enhancing Security With Your Firewall.......................................................... 13-9

13.5.1 Security In General......................................................................................................... 13-10

Chapter 14

Introducing the Prestige Firewall ..............................................................................14-1

14.1 SMT Menus.............................................................................................................................. 14-1

14.1.1 View Firewall Log............................................................................................................ 14-2

14.1.2 Attack Types..................................................................................................................... 14-2

14.2 The Big Picture – Filtering, Firewall and NAT........................................................................ 14-5

14.3 Packet Filtering Vs Firewall..................................................................................................... 14-6

14.3.1 Packet Filtering:................................................................................................................14-6

14.3.2 Firewall:............................................................................................................................14-7

Chapter 15

Introducing the Prestige Web Configurator...............................................................15-1

15.1 Web Configurator Login and Welcome Screens...................................................................... 15-1

15.2 Enabling the Firewall ............................................................................................................... 15-2

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Table Of Contents

15.3 E-Mail.......................................................................................................................................15-3

15.3.1 What are Alerts?................................................................................................................15-3

15.3.2 What are Logs? .................................................................................................................15-4

15.3.3 SMTP Error Messages ......................................................................................................15-6

15.3.4 Example E-Mail Log.........................................................................................................15-6

15.4 Attack Alert...............................................................................................................................15-7

15.4.1 Threshold Values: .............................................................................................................15-8

15.4.2 Half-Open Sessions...........................................................................................................15-8

Chapter 16

Creating Custom Rules.............................................................................................16-1

16.1 Rules Overview.........................................................................................................................16-1

16.2 Rule Logic Overview................................................................................................................16-1

16.2.1 Rule Checklist...................................................................................................................16-1

16.2.2 Security Ramifications......................................................................................................16-2

16.2.3 Key Fields For Configuring Rules ....................................................................................16-2

16.3 Connection Direction................................................................................................................16-3

16.3.1 LAN to WAN Rules..........................................................................................................16-3

16.3.2 WAN to LAN Rules..........................................................................................................16-3

16.4 Services Supported....................................................................................................................16-4

16.5 Rule Summary...........................................................................................................................16-6

16.5.1 Creating/Editing Firewall Rules........................................................................................16-8

16.5.2 Source & Destination Addresses.....................................................................................16-10

16.6 Timeout...................................................................................................................................16-12

16.6.1 Factors Influencing Choices for Timeout Values:...........................................................16-12

Chapter 17

Custom Ports ............................................................................................................17-1

17.1 Introduction...............................................................................................................................17-1

17.2 Creating/Editing A Custom Port...............................................................................................17-2

Chapter 18

Logs ..........................................................................................................................18-1

18.1 Log Screen................................................................................................................................18-1

Chapter 19 Example Firewall Rules ............................................................................................19-1

19.1 Examples...................................................................................................................................19-1

19.1.1 Example 1 - Firewall Rule To Allow Web Service From The Internet.............................19-1

19.1.2 Example 2 – Small Office With Mail, FTP and Web Servers...........................................19-6

19.1.3 Example 3: DHCP Negotiation and Syslog Connection from the Internet .....................19-11

Chapter 20

Content Filtering........................................................................................................20-1

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Table Of Contents xv

20.1 Restrict Web Features...............................................................................................................20-1

20.1.1 ActiveX ............................................................................................................................20-1

20.1.2 Java...................................................................................................................................20-1

20.1.3 Cookies............................................................................................................................. 20-2

20.1.4 Web Proxy........................................................................................................................ 20-2

20.2 Blocking URLs......................................................................................................................... 20-2

20.3 Content Filtering Using the PWC............................................................................................. 20-2

Troubleshooting, Appendices, Glossary and Index......................................................................V

Chapter 21 Troubleshooting........................................................................................................21-1

21.1 Problems Starting Up the Prestige............................................................................................ 21-1

21.2 Problems with the LAN Interface.............................................................................................21-2

21.3 Problems with the WAN interface............................................................................................21-2

21.4 Problems with Internet Access................................................................................................. 21-3

21.5 Problems with the Firewall....................................................................................................... 21-3

Appendix A PPPoE......................................................................................................................E

Appendix B PPTP......................................................................................................................G

Appendix C Hardware Specifications............................................................................................I

Appendix D Important Safety Instructions....................................................................................J

Appendix E Firewall CLI Commands...........................................................................................K

Appendix F Power Adapter Specs...............................................................................................P

Glossary of Terms..........................................................................................................................R

Index............................................................................................................................................CC

P312 Broadband Security Gateway

xvi List Of Figures

List of Figures

Figure 1-1 Secure Internet Access via Cable............................................................................................1-3

Figure 1-2 Secure Internet Access via DSL..............................................................................................1-4

Figure 2-1 Front Panel.............................................................................................................................2-1

Figure 2-2 Prestige 312 Rear Panel and Connections...............................................................................2-2

Figure 2-3 Initial Screen...........................................................................................................................2-4

Figure 2-4 Password Screen .....................................................................................................................2-5

Figure 2-5 Prestige 312 Main Menu........................................................................................................2-6

Figure 2-6 Menu 23 - System Security.....................................................................................................2-7

Figure 2-7 Menu 1 – General Setup..........................................................................................................2-8

Figure 2-8 Configure Dynamic DNS........................................................................................................2-9

Figure 2-9 Menu 2 – WAN Setup...........................................................................................................2-11

Figure 2-10 Menu 3 - LAN Setup.............................................................................................................2-12

Figure 2-11 Menu 3.1 – LAN Port Filter Setup........................................................................................2-12

Figure 3-1 Physical Network....................................................................................................................3-4

Figure 3-2 Partitioned Logical Networks .................................................................................................3-4

Figure 3-3 Menu 3 - LAN Setup (10/100 Mbps Ethernet) .......................................................................3-5

Figure 3-4 Menu 3.2 – TCP/IP and DHCP Ethernet Setup ......................................................................3-5

Figure 3-5 Menu 3.2.1 - IP Alias Setup....................................................................................................3-7

Figure 3-6 Menu 4 – Internet Access Setup (Ethernet) ............................................................................3-8

Figure 3-7 Internet Access Setup (PPTP)...............................................................................................3-10

Figure 3-8 Internet Access Setup (PPPoE).............................................................................................3-11

Figure 4-1 Menu 11.1 Remote Node Profile for Ethernet Encapsulation.................................................4-1

Figure 4-2 Menu 11.1 Remote Node Profile for PPPoE Encapsulation ...................................................4-3

Figure 4-3 Remote Node Profile for PPTP Encapsulation .......................................................................4-5

Figure 4-4 Remote Node Network Layer Options...................................................................................4-6

P312 Broadband Security Gateway

List Of Figures xvii

Figure 4-5 Remote Node Network Layer Options.................................................................................. 4-8

Figure 4-6 Remote Node Filter (Ethernet Encapsulation)...................................................................... 4-10

Figure 4-7 Remote Node Filter (PPPoE or PPTP Encapsulation).......................................................... 4-10

Figure 5-1 Example of Static Routing Topology..................................................................................... 5-1

Figure 5-2 Menu 12 - IP Static Route Setup............................................................................................ 5-2

Figure 5-3 Menu 12. 1 - Edit IP Static Route .......................................................................................... 5-2

Figure 6-1 How NAT Works................................................................................................................... 6-2

Figure 6-2 NAT Application.................................................................................................................... 6-4

Figure 6-3 Applying NAT for Internet Access......................................................................................... 6-5

Figure 6-4 Applying NAT to the Remote Node.......................................................................................6-5

Figure 6-5 Menu 15 NAT Setup............................................................................................................... 6-6

Figure 6-6 Menu 15.1 Address Mapping Sets ......................................................................................... 6-7

Figure 6-7 SUA Address Mapping Rules ................................................................................................ 6-7

Figure 6-8 First Set in Menu 15.1.1......................................................................................................... 6-9

Figure 6-9 Editing an Individual Rule in a Set...................................................................................... 6-10

Figure 6-10 Multiple Servers Behind NAT.............................................................................................. 6-12

Figure 6-11 Menu 15.2 – NAT Server Setup ........................................................................................... 6-13

Figure 6-12 NAT Example 1................................................................................................................... 6-14

Figure 6-13 Internet Access & NAT Example........................................................................................ 6-14

Figure 6-14 NAT Example 2................................................................................................................... 6-15

Figure 6-15 Specifying an Inside Sever.................................................................................................. 6-15

Figure 6-16 NAT - Example 3 ................................................................................................................ 6-16

Figure 6-17 Example 3 – Menu 11.3 ...................................................................................................... 6-17

Figure 6-18 Example 3 – Menu 15.1.1.1 ................................................................................................ 6-17

Figure 6-19 Example 3 Final Menu 15.1.1 ............................................................................................. 6-18

Figure 6-20 Example 3 – Menu 15.2 ...................................................................................................... 6-18

Figure 6-21 NAT Example 4.................................................................................................................... 6-19

P312 Broadband Security Gateway

xviii List Of Figures

Figure 6-22 Example 4- Menu 15.1.1.1 - Address Mapping Rule............................................................6-20

Figure 6-23 Example 4 - Menu 15.1.1 - Address Mapping Rules............................................................6-20

Figure 7-1 Outgoing Packet Filtering Process..........................................................................................7-1

Figure 7-2 Filter Rule Process..................................................................................................................7-3

Figure 7-4 Menu 21 – Filter and Firewall Setup.......................................................................................7-4

Figure 7-5 Menu 21.1 - Filter Set Configuration......................................................................................7-4

Figure 7-6 NetBIOS_WAN Filter Rules Summary...................................................................................7-5

Figure 7-7 NetBIOS _LAN Filter Rules Summary ..................................................................................7-5

Figure 7-8 TEL_FTP_WEB_WAN Filter Rules Summary ......................................................................7-5

Figure 7-9 Menu 21.1.1.1 - TCP/IP Filter Rule........................................................................................7-8

Figure 7-10 Executing an IP Filter ...........................................................................................................7-11

Figure 7-11 Menu 21.4.1.1 - Generic Filter Rule.....................................................................................7-12

Figure 7-12 Telnet Filter Example............................................................................................................7-14

Figure 7-13 Example Filter – Menu 21.1.1.1 ...........................................................................................7-15

Figure 7-14 Example Filter Rules Summary – Menu 21.1.3....................................................................7-16

Figure 7-15 Protocol and Device Filter Sets.............................................................................................7-17

Figure 7-16 Filtering LAN Traffic............................................................................................................7-18

Figure 7-17 Filtering Remote Node Traffic..............................................................................................7-18

Figure 8-1 Menu 22 - SNMP Configuration.............................................................................................8-1

Figure 9-1 Menu 24 - System Maintenance..............................................................................................9-1

Figure 9-2 Menu 24.1 - System Maintenance – Status.............................................................................9-2

Figure 9-3 Menu 24.2 – System Information and Console Port Speed ....................................................9-4

Figure 9-4 Menu 24.2.1 System Maintenance - Information....................................................................9-4

Figure 9-5 Menu 24.2.2 – System Maintenance – Change Console Port Speed.....................................9-5

Figure 9-6 Examples of Error and Information Messages........................................................................9-6

Figure 9-7 Examples of Error and Information Messages........................................................................9-6

Figure 9-8 Menu 24.3.2 - System Maintenance – UNIX Syslog..............................................................9-7

P312 Broadband Security Gateway

List Of Figures xix

Figure 9-9 Call-Triggering Packet Example.......................................................................................... 9-10

Figure 9-10 Menu 24.4 - System Maintenance - Diagnostic ....................................................................9-11

Figure 9-11 WAN & LAN DHCP............................................................................................................ 9-12

Figure 10-1 Menu 24.5 - System Maintenance - Backup Configuration................................................. 10-2

Figure 10-2 Menu 24.6 - System Maintenance - Restore Configuration................................................. 10-3

Figure 10-3 Menu 24.7 - System Maintenance - Upload Firmware......................................................... 10-3

Figure 10-4 Menu 24.7.1 - System Maintenance - Upload Router Firmware.......................................... 10-4

Figure 10-5 Menu 24.7.2 - System Maintenance - Upload Router Configuration File............................ 10-5

Figure 10-6 Telnet into Menu 24.7.1 ....................................................................................................... 10-7

Figure 10-7 Telnet into Menu 24.7.2 - System Maintenance................................................................... 10-8

Figure 10-8 FTP Session Example........................................................................................................... 10-9

Figure 11-1 Command Mode in Menu 24.................................................................................................11-1

Figure 11-2 Valid Commands...................................................................................................................11-1

Figure 11-3 Call Control...........................................................................................................................11-2

Figure 11-4 Budget Management ............................................................................................................11-2

Figure 11-5 Call History..........................................................................................................................11-3

Figure 11-6 System Maintenance – Time and Date Setting.....................................................................11-5

Figure 11-7 Menu 24.11 - Remote Management Control.........................................................................11-6

Figure 11-8 Option to Enter Debug Mode................................................................................................11-7

Figure 11-9 Boot Module Commands ......................................................................................................11-8

Figure 12-1 Telnet Configuration on a TCP/IP Network......................................................................... 12-1

Figure 13-1 Prestige Firewall Application............................................................................................... 13-3

Figure 13-2 Three-Way Handshake......................................................................................................... 13-4

Figure 13-3 SYN Flood ........................................................................................................................... 13-5

Figure 13-4 Smurf Attack........................................................................................................................ 13-6

Figure 13-5 Stateful Inspection................................................................................................................ 13-7

Figure 14-1 SMT Main Menu.................................................................................................................. 14-1

P312 Broadband Security Gateway

xx List Of Figures

Figure 14-2 Menu 21 - Filter and Firewall Setup.....................................................................................14-1

Figure 14-3 Menu 21.2 – Firewall Setup..................................................................................................14-2

Figure 14-4 View Firewall Log ................................................................................................................14-4

Figure 14-5 Big Picture - Filtering, Firewall and NAT.............................................................................14-6

Figure 15-1 Login screen as seen in Netscape..........................................................................................15-1

Figure 15-2 Prestige Web Configurator Welcome Screen........................................................................15-2

Figure 15-3 Enabling the Firewall............................................................................................................15-3

Figure 15-4 E-Mail Screen .......................................................................................................................15-4

Figure 15-5 E-Mail Log............................................................................................................................15-7

Figure 15-6 Attack Alert...........................................................................................................................15-9

Figure 16-1 LAN to WAN Traffic............................................................................................................16-3

Figure 16-2 WAN to LAN Traffic............................................................................................................16-4

Figure 16-3 Firewall Rules Summary – First Screen................................................................................16-6

Figure 16-4 Creating/Editing A Firewall Rule .........................................................................................16-9

Figure 16-5 Adding/Editing Source & Destination Addresses...............................................................16-11

Figure 16-6 Timeout Screen...................................................................................................................16-13

Figure 17-1 Custom Ports.........................................................................................................................17-1

Figure 17-2 Creating/Editing A Custom Port...........................................................................................17-3

Figure 18-1 Log Screen............................................................................................................................18-1

Figure 19-1 Activate The Firewall............................................................................................................19-2

Figure 19-2 Example 1 – E-Mail Screen ..................................................................................................19-3

Figure 19-3 Example 1 – Configuring A Rule..........................................................................................19-4

Figure 19-4 Example 1: Destination Address for Traffic Originating From The Internet........................19-5

Figure 19-5 Example 1 - Rule Summary Screen......................................................................................19-6

Figure 19-6 Send Alerts When Attacked..................................................................................................19-7

Figure 19-7 Configuring A POP Custom Port..........................................................................................19-8

Figure 19-8 Example 2 - Local Network Rule 1 Configuration ...............................................................19-9

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