ZyXEL Communications ADSL 2+ Security Gateway User manual

ZyWALL 2/2WE

Internet Security Gateway

User’s Guide

Version 3.60

March 2003

ZyWALL 2 and ZyWALL 2WE

ii Copyright

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.

ZyWALL 2 and ZyWALL 2WE

FCC 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.

Certifications

Refer to the product page at www.zyxel.com.

ZyWALL 2 and ZyWALL 2WE

iv Information for 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.

ZyWALL 2 and ZyWALL 2WE

Warranty v

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

to country.

Online Registration

Register online registration at www.zyxel.com for free future product updates and information.

ZyWALL 2 and ZyWALL 2WE

vi Customer Support

Customer Support

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

Please have the following information ready when you contact customer support.

• Product model and serial number.

• Information in Menu 24.2.1 – System Information.

• Warranty Information.

• Date that you received your device.

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

METHOD

LOCATION

E-MAIL

SUPPORT/SALES

TELEPHONE/FAX WEB SITE/ FTP SITE REGULAR MAIL

[email protected]m.tw

+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

300, Taiwan

[email protected]m +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] +49-2405-6909-0 www.zyxel.de GERMANY

sales@zyxel.de

+49-2405-6909-99

ZyXEL Deutschland GmbH.

Adenauerstr. 20/A2 D-52146

Wuerselen, Germany

ZyWALL 2 and ZyWALL 2WE

Table of Contents vii

Table of Contents

Copyright......................................................................................................................................................ii

Federal Communications Commission (FCC) Interference Statement................................................. iii

Information for Canadian Users ...............................................................................................................iv

ZyXEL Limited Warranty ..........................................................................................................................v

Customer Support ......................................................................................................................................vi

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

List of Tables .......................................................................................................................................... xxiii

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

Overview ........................................................................................................................................................... I

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

1.1 Introducing the ZyWALL 2/2WE Internet Security Gateway ................................................... 1-1

1.2 Features ...................................................................................................................................... 1-1

1.3 Applications for the ZyWALL................................................................................................... 1-5

Chapter 2 Hardware Installation ........................................................................................................... 2-1

2.1 Introduction to Hardware Installation ........................................................................................ 2-1

2.2 Front Panels LEDs .................................................................................................................... 2-1

2.3 LED Descriptions....................................................................................................................... 2-2

2.4 ZyWALL Rear Panels and Connections .................................................................................... 2-3

2.5 Hardware Connections ............................................................................................................... 2-3

2.6 Hardware Mounting Options...................................................................................................... 2-5

2.7 Additional Installation Requirements for Using 802.1x............................................................. 2-5

2.8 Turning On Your ZyWALL....................................................................................................... 2-5

Initial Setup and Configuration.....................................................................................................................II

Chapter 3 Introducing the Web Configurator ......................................................................................3-1

3.1 Introduction to the Web Configurator ........................................................................................ 3-1

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3.2 Accessing the ZyWALL Web Configurator ...............................................................................3-1

3.3 Web Configurator Navigation.....................................................................................................3-2

Chapter 4 Introducing the SMT..............................................................................................................4-1

4.1 Introduction to the SMT..............................................................................................................4-1

4.2 Accessing the Console Port via the Console Port .......................................................................4-1

4.3 Navigating the SMT Interface.....................................................................................................4-2

4.4 Changing the System Password ..................................................................................................4-7

4.5 Resetting the ZyWALL...............................................................................................................4-8

Chapter 5 SMT Menu 1 - General Setup................................................................................................5-1

5.1 Introduction to General Setup.....................................................................................................5-1

5.2 System Name ..............................................................................................................................5-1

5.3 Dynamic DNS.............................................................................................................................5-1

5.4 General Setup..............................................................................................................................5-2

Chapter 6 WAN Setup..............................................................................................................................6-1

6.1 Introduction to WAN Setup ........................................................................................................6-1

6.2 Cloning The MAC Address ........................................................................................................6-1

6.3 WAN Setup.................................................................................................................................6-1

Chapter 7 LAN Setup...............................................................................................................................7-1

7.1 Introduction to LAN Setup .........................................................................................................7-1

7.2 Accessing the LAN Menus .........................................................................................................7-1

7.3 LAN Port Filter Setup.................................................................................................................7-1

7.4 TCP/IP and LAN DHCP.............................................................................................................7-2

7.5 TCP/IP and DHCP Ethernet Setup Menu ...................................................................................7-5

7.6 Wireless LAN ...........................................................................................................................7-10

7.7 Wireless LAN Setup .................................................................................................................7-11

Chapter 8 Wireless LAN Security Setup ................................................................................................8-1

8.1 Introduction to Wireless LAN Security ......................................................................................8-1

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8.2 Levels of Security ...................................................................................................................... 8-1

8.3 Data Encryption with WEP ........................................................................................................8-2

8.4 Network Authentication ............................................................................................................. 8-3

8.5 Local User Authentication ......................................................................................................... 8-8

8.6 MAC Address Filtering............................................................................................................ 8-10

Chapter 9 Internet Access ....................................................................................................................... 9-1

9.1 Introduction to Internet Access Setup ........................................................................................ 9-1

9.2 Ethernet Encapsulation............................................................................................................... 9-1

9.3 PPTP Encapsulation ................................................................................................................... 9-2

9.4 PPPoE Encapsulation ................................................................................................................. 9-3

9.5 Basic Setup Complete ................................................................................................................ 9-5

Advanced Applications ................................................................................................................................. III

Chapter 10 Remote Node Setup............................................................................................................ 10-1

10.1 Introduction to Remote Node Setup..................................................................................... 10-1

10.2 Remote Node Setup.............................................................................................................. 10-1

10.3 Remote Node Profile Setup.................................................................................................. 10-2

10.4 Edit IP .................................................................................................................................. 10-7

10.5 Remote Node Filter ..............................................................................................................10-9

10.6 Traffic Redirect .................................................................................................................. 10-10

Chapter 11 IP Static Route Setup ..........................................................................................................11-1

11.1 Introduction to Static Route ................................................................................................. 11-1

11.2 IP Static Route Setup............................................................................................................ 11-2

Chapter 12 Network Address Translation (NAT) ............................................................................... 12-1

12.1 Introduction to NAT.............................................................................................................12-1

12.2 Using NAT........................................................................................................................... 12-6

12.3 NAT Setup ........................................................................................................................... 12-8

12.4 NAT Server Sets – Port Forwarding .................................................................................. 12-14

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12.5 General NAT Examples......................................................................................................12-17

12.6 Trigger Port Forwarding .....................................................................................................12-24

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

Chapter 13 Firewalls ..............................................................................................................................13-1

13.1 Introduction to Firewalls.......................................................................................................13-1

13.2 Types of Firewalls.................................................................................................................13-1

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

13.4 Denial of Service...................................................................................................................13-3

13.5 Stateful Inspection ................................................................................................................13-7

13.6 Guidelines For Enhancing Security With Your Firewall ....................................................13-11

13.7 Packet Filtering Vs Firewall ...............................................................................................13-12

Chapter 14 Introducing the ZyWALL Firewall ...................................................................................14-1

14.1 Introduction to the ZyWALL Firewall..................................................................................14-1

14.2 Remote Management and the Firewall .................................................................................14-1

14.3 Access Methods ....................................................................................................................14-1

14.4 Using ZyWALL SMT Menus ...............................................................................................14-1

Chapter 15 Firewall Configuration.......................................................................................................15-1

15.1 Introduction to Firewall Configuration .................................................................................15-1

15.2 Enabling the Firewall............................................................................................................15-1

15.3 Attack Alert...........................................................................................................................15-3

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

16.1 Introduction to Custom Rules ...............................................................................................16-1

16.2 Rule Logic Overview............................................................................................................16-2

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

16.4 Rule Summary ......................................................................................................................16-5

16.5 Predefined Services...............................................................................................................16-7

16.6 Custom Ports.......................................................................................................................16-14

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16.7 Creating/Editing A Custom Port ........................................................................................ 16-14

16.8 Example Firewall Rule....................................................................................................... 16-15

Chapter 17 Content Filtering................................................................................................................ 17-1

17.1 Introduction to Content Filtering.......................................................................................... 17-1

17.2 Restrict Web Features .......................................................................................................... 17-1

17.3 Days and Times.................................................................................................................... 17-1

17.4 Configure Content Filtering ................................................................................................. 17-1

Logs, Filter Configuration, and SNMP Configuration ................................................................................V

Chapter 18 Centralized Logs ................................................................................................................ 18-1

18.1 Introduction to Centralized Logs.......................................................................................... 18-1

18.2 View Log.............................................................................................................................. 18-1

18.3 Log Settings ......................................................................................................................... 18-3

18.4 Reports ................................................................................................................................. 18-6

Chapter 19 Filter Configuration........................................................................................................... 19-1

19.1 Introduction to Filters........................................................................................................... 19-1

19.2 Configuring a Filter Set........................................................................................................19-4

19.3 Example Filter.................................................................................................................... 19-13

19.4 Filter Types and SUA/NAT ............................................................................................... 19-16

19.5 Firewall Versus Filters ....................................................................................................... 19-16

19.6 Applying a Filter and Factory Defaults.............................................................................. 19-17

Chapter 20 SNMP Configuration......................................................................................................... 20-1

20.1 Introduction to SNMP .......................................................................................................... 20-1

20.2 Supported MIBs ................................................................................................................... 20-3

20.3 SNMP Configuration............................................................................................................ 20-3

20.4 SNMP Traps......................................................................................................................... 20-4

System Information and Diagnosis and Firmware and Configuration File Maintenance...................... VI

Chapter 21 System Information & Diagnosis...................................................................................... 21-1

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21.1 Introduction to System Status ...............................................................................................21-1

21.2 System Status........................................................................................................................21-1

21.3 System Information and Console Port Speed........................................................................21-3

21.4 Log and Trace .......................................................................................................................21-6

21.5 Diagnostic ...........................................................................................................................21-11

Chapter 22 Firmware and Configuration File Maintenance ..............................................................22-1

22.1 Filename Conventions ..........................................................................................................22-1

22.2 Backup Configuration...........................................................................................................22-2

22.3 Restore Configuration...........................................................................................................22-8

22.4 Uploading Firmware and Configuration Files ....................................................................22-11

System Maintenance and Information and Remote Management .......................................................... VII

Chapter 23 System Maintenance & Information.................................................................................23-1

23.1 Command Interpreter Mode..................................................................................................23-1

23.2 Call Control Support.............................................................................................................23-2

23.3 Time and Date Setting ..........................................................................................................23-5

Chapter 24 Remote Management .........................................................................................................24-1

24.1 Remote Management and the Firewall .................................................................................24-1

24.2 Telnet ....................................................................................................................................24-1

24.3 FTP .......................................................................................................................................24-2

24.4 Web.......................................................................................................................................24-2

24.5 SNMP ...................................................................................................................................24-2

24.6 DNS ......................................................................................................................................24-2

24.7 Remote Management ............................................................................................................24-2

24.8 Remote Management and SUA/NAT ...................................................................................24-4

24.9 System Timeout ....................................................................................................................24-5

Call Scheduling and VPN/IPSec ................................................................................................................VIII

Chapter 25 Call Scheduling...................................................................................................................25-1

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25.1 Introduction to Call Scheduling ........................................................................................... 25-1

25.2 Configuring Call Scheduling................................................................................................ 25-1

25.3 Applying Schedule Sets ....................................................................................................... 25-3

Chapter 26 Introduction to IPSec......................................................................................................... 26-1

26.1 VPN Overview..................................................................................................................... 26-1

26.2 IPSec Architecture ............................................................................................................... 26-3

26.3 Encapsulation ....................................................................................................................... 26-5

26.4 IPSec and NAT .................................................................................................................... 26-5

Chapter 27 VPN/IPSec Setup ............................................................................................................... 27-1

27.1 VPN/IPSec Overview........................................................................................................... 27-1

27.2 IPSec Algorithms ................................................................................................................. 27-1

27.3 My IP Address...................................................................................................................... 27-2

27.4 Secure Gateway Address...................................................................................................... 27-2

27.5 Summary Screen ..................................................................................................................27-3

27.6 Keep Alive ........................................................................................................................... 27-4

27.7 NAT Traversal ..................................................................................................................... 27-5

27.8 ID Type and Content............................................................................................................ 27-5

27.9 Configuring Basic IKE VPN Rule Setup ............................................................................. 27-7

27.10 IKE Phases ......................................................................................................................... 27-12

27.11 Configuring Advanced IKE Setup ..................................................................................... 27-14

27.12 Manual Key Setup.............................................................................................................. 27-20

27.13 Configuring Edit Manual Setup ......................................................................................... 27-20

27.14 SA Monitor ........................................................................................................................ 27-24

27.15 Global Settings................................................................................................................... 27-26

27.16 Telecommuter VPN/IPSec Examples ................................................................................ 27-27

Troubleshooting............................................................................................................................................. IX

Chapter 28 Troubleshooting ................................................................................................................. 28-1

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23.1 Problems Starting Up the ZyWALL .....................................................................................28-1

28.1 Problems with a LAN Interface ............................................................................................28-2

28.2 Problems with the WAN Interface........................................................................................28-2

28.3 Problems with Internet Access..............................................................................................28-3

23.2 Problems with the Password .................................................................................................28-3

28.4 Problems with Remote Management ....................................................................................28-3

General Appendices........................................................................................................................................ X

Appendix A Setting up Your Computer’s IP Address............................................................................... 1

Appendix B Antennas................................................................................................................................ 14

Appendix C Triangle Route ...................................................................................................................... 16

Appendix D The Big Picture..................................................................................................................... 19

Appendix E Wireless LAN and IEEE 802.11 .......................................................................................... 20

Appendix F Wireless LAN With IEEE 802.1x ........................................................................................23

Appendix G PPPoE ................................................................................................................................... 27

Appendix H PPTP ..................................................................................................................................... 29

Appendix I Hardware Specifications....................................................................................................... 32

Appendix J Universal Plug and Play ....................................................................................................... 36

Appendix K IP Subnetting........................................................................................................................ 45

Appendix L Safety Warnings and Instructions....................................................................................... 53

Command and Log Appendices....................................................................................................................XI

Appendix M Command Interpreter......................................................................................................... 57

Appendix N Firewall Commands............................................................................................................. 58

Appendix O NetBIOS Filter Commands................................................................................................. 65

Appendix P Boot Commands.................................................................................................................... 68

Appendix Q Log Descriptions .................................................................................................................. 70

Appendix R Brute-Force Password Guessing Protection ...................................................................... 88

Index ............................................................................................................................................................. XII

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Table of Contents xv

Index ............................................................................................................................................................A

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xvi List of Figures

List of Figures

Figure 1-1 Secure Internet Access and VPN Application ...............................................................................1-6

Figure 1-2 ZyWALL 2WE Wireless LAN Application...................................................................................1-6

Figure 2-1 ZyWALL 2WE Front Panel...........................................................................................................2-1

Figure 2-2 ZyWALL 2 Front Panel.................................................................................................................2-2

Figure 2-3 ZyWALL 2WE Rear Panel............................................................................................................2-3

Figure 2-4 ZyWALL 2 Rear Panel..................................................................................................................2-3

Figure 3-1 Change Password Screen ..............................................................................................................3-1

Figure 3-2 Web Configurator Main Menu ......................................................................................................3-2

Figure 4-1 Initial Screen .................................................................................................................................4-1

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

Figure 4-3 Main Menu (ZyWALL 2WE)........................................................................................................4-3

Figure 4-4 Getting Started and Advanced Applications SMT Menus (ZyWALL 2WE).................................4-5

Figure 4-5 Advanced Management SMT Menus ............................................................................................4-6

Figure 4-6 Schedule Setup and IPSec VPN Configuration SMT Menus........................................................4-7

Figure 4-7 Menu 23: System Password ..........................................................................................................4-7

Figure 4-8 Example Xmodem Upload............................................................................................................4-8

Figure 5-1 Menu 1: General Setup..................................................................................................................5-2

Figure 5-2 Configure Dynamic DNS..............................................................................................................5-3

Figure 6-1 MAC Address Cloning in WAN Setup..........................................................................................6-1

Figure 7-1 Menu 3: LAN Setup......................................................................................................................7-1

Figure 7-2 Menu 3.1: LAN Port Filter Setup..................................................................................................7-2

Figure 7-3 Physical Network ..........................................................................................................................7-5

Figure 7-4 Partitioned Logical Networks .......................................................................................................7-5

Figure 7-5 Menu 3: TCP/IP and DHCP Setup ................................................................................................7-6

Figure 7-6 Menu 3.2: TCP/IP and DHCP Ethernet Setup...............................................................................7-6

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List of Figures xvii

Figure 7-7 Menu 3.2.1: IP Alias Setup........................................................................................................... 7-9

Figure 7-8 RTS Threshold............................................................................................................................7-11

Figure 7-9 Menu 3.5 – Wireless LAN Setup................................................................................................ 7-12

Figure 8-1 ZyWALL Wireless Security Levels .............................................................................................. 8-1

Figure 8-2 Wireless LAN............................................................................................................................... 8-2

Figure 8-3 Sequence for EAP Authentication ................................................................................................ 8-5

Figure 8-4 Wireless LAN 802.1X Authentication.......................................................................................... 8-6

Figure 8-5 Authentication RADIUS............................................................................................................... 8-7

Figure 8-6 Local User Database..................................................................................................................... 8-9

Figure 8-7 WLAN MAC Address Filter....................................................................................................... 8-10

Figure 9-1 Menu 4: Internet Access Setup (Ethernet) .................................................................................... 9-1

Figure 9-2 Internet Access Setup (PPTP)....................................................................................................... 9-3

Figure 9-3 Internet Access Setup (PPPoE)..................................................................................................... 9-4

Figure 10-1 Menu 11 Remote Node Setup................................................................................................... 10-1

Figure 10-2 Menu 11.1: Remote Node Profile for Ethernet Encapsulation ................................................. 10-2

Figure 10-3 Menu 11.1: Remote Node Profile for PPPoE Encapsulation.................................................... 10-4

Figure 10-4 Menu 11.1: Remote Node Profile for PPTP Encapsulation...................................................... 10-6

Figure 10-5 Menu 11.3: Remote Node Network Layer Options for Ethernet Encapsulation ...................... 10-7

Figure 10-6 Menu 11.5: Remote Node Filter (Ethernet Encapsulation)....................................................... 10-9

Figure 10-7 Menu 11.5: Remote Node Filter (PPPoE or PPTP Encapsulation)......................................... 10-10

Figure 10-8 Traffic Redirect WAN Setup................................................................................................... 10-10

Figure 10-9 Traffic Redirect LAN Setup ....................................................................................................10-11

Figure 10-10 Menu 11.1: Remote Node Profile..........................................................................................10-11

Figure 10-11 Menu 11.6: Traffic Redirect Setup........................................................................................ 10-12

Figure 11-1 Example of Static Routing Topology.........................................................................................11-1

Figure 11-2 Menu 12: IP Static Route Setup.................................................................................................11-2

Figure 11-3 Menu 12. 1: Edit IP Static Route ...............................................................................................11-3

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xviii List of Figures

Figure 12-1 How NAT Works .......................................................................................................................12-3

Figure 12-2 NAT Application With IP Alias .................................................................................................12-4

Figure 12-3 Menu 4: Applying NAT for Internet Access..............................................................................12-7

Figure 12-4 Menu 11.3: Applying NAT to the Remote Node .......................................................................12-8

Figure 12-5 Menu 15: NAT Setup ................................................................................................................12-9

Figure 12-6 Menu 15.1: Address Mapping Sets ...........................................................................................12-9

Figure 12-7 Menu 15.1.255: SUA Address Mapping Rules .......................................................................12-10

Figure 12-8 Menu 15.1.1: First Set.............................................................................................................12-11

Figure 12-9 Menu 15.1.1.1: Editing/Configuring an Individual Rule in a Set............................................12-13

Figure 12-10 Menu 15.2: NAT Server Setup ..............................................................................................12-16

Figure 12-11 Multiple Servers Behind NAT Example................................................................................12-16

Figure 12-12 NAT Example 1.....................................................................................................................12-17

Figure 12-13 Menu 4: Internet Access & NAT Example............................................................................12-17

Figure 12-14 NAT Example 2.....................................................................................................................12-18

Figure 12-15 Menu 15.2: Specifying an Inside Server ...............................................................................12-19

Figure 12-16 NAT Example 3.....................................................................................................................12-20

Figure 12-17 Example 3: Menu 11.3 ..........................................................................................................12-21

Figure 12-18 Example 3: Menu 15.1.1.1 ....................................................................................................12-21

Figure 12-19 Example 3: Final Menu 15.1.1 ..............................................................................................12-22

Figure 12-20 Example 3: Menu 15.2 ..........................................................................................................12-22

Figure 12-21 NAT Example 4.....................................................................................................................12-23

Figure 12-22 Example 4: Menu 15.1.1.1: Address Mapping Rule .............................................................12-24

Figure 12-23 Example 4: Menu 15.1.1: Address Mapping Rules...............................................................12-24

Figure 12-24 Trigger Port Forwarding Process: Example ..........................................................................12-25

Figure 12-25 Menu 15.3—Trigger Port Setup............................................................................................12-26

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

Figure 13-2 Three-Way Handshake ..............................................................................................................13-5

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List of Figures xix

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

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

Figure 13-5 Stateful Inspection.................................................................................................................... 13-8

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

Figure 14-2 Menu 21.2: Firewall Setup ....................................................................................................... 14-2

Figure 15-1 Enabling the Firewall ............................................................................................................... 15-2

Figure 15-2 Attack Alert .............................................................................................................................. 15-5

Figure 16-1 LAN to WAN Traffic................................................................................................................ 16-4

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

Figure 16-3 Firewall Rules Summary: First Screen..................................................................................... 16-5

Figure 16-4 Creating/Editing A Firewall Rule ............................................................................................16-11

Figure 16-5 Adding/Editing Source and Destination Addresses ................................................................ 16-13

Figure 16-6 Creating/Editing A Custom Port............................................................................................. 16-14

Figure 16-7 Firewall Rule Configuration Screen Example........................................................................ 16-16

Figure 16-8 Firewall IP Config Screen Example ....................................................................................... 16-17

Figure 16-9 Custom Port Example............................................................................................................. 16-18

Figure 16-10 Rule Configuration Example ................................................................................................ 16-19

Figure 16-11 Rule Summary Example....................................................................................................... 16-20

Figure 17-1Content Filter............................................................................................................................. 17-2

Figure 18-1 View Log .................................................................................................................................. 18-2

Figure 18-2 Log Settings.............................................................................................................................. 18-4

Figure 18-3 Reports ..................................................................................................................................... 18-7

Figure 18-4 Web Site Hits Report Example ................................................................................................. 18-9

Figure 18-5 Protocol/Port Report Example................................................................................................ 18-10

Figure 18-6 LAN IP Address Report Example............................................................................................18-11

Figure 19-1 Outgoing Packet Filtering Process ........................................................................................... 19-2

Figure 19-2 Filter Rule Process.................................................................................................................... 19-3

ZyWALL 2 and ZyWALL 2WE

xx List of Figures

Figure 19-3 Menu 21: Filter and Firewall Setup...........................................................................................19-4

Figure 19-4 Menu 21.1: Filter Set Configuration .........................................................................................19-4

Figure 19-5 Menu 21.1.1.1: TCP/IP Filter Rule ...........................................................................................19-7

Figure 19-6 Executing an IP Filter..............................................................................................................19-10

Figure 19-7 Menu 21.1.4.1: Generic Filter Rule.........................................................................................19-11

Figure 19-8 Telnet Filter Example ..............................................................................................................19-13

Figure 19-9 Example Filter: Menu 21.1.3.1................................................................................................19-14

Figure 19-10 Example Filter Rules Summary: Menu 21.1.3 ......................................................................19-15

Figure 19-11 Protocol and Device Filter Sets .............................................................................................19-16

Figure 19-12 Filtering LAN Traffic............................................................................................................19-17

Figure 19-13 Filtering Remote Node Traffic ..............................................................................................19-18

Figure 20-1 SNMP Management Model.......................................................................................................20-2

Figure 20-2 Menu 22: SNMP Configuration ................................................................................................20-3

Figure 21-1 Menu 24: System Maintenance.................................................................................................21-1

Figure 21-2 Menu 24.1: System Maintenance: Status (ZyWALL 2WE) .....................................................21-2

Figure 21-3 Menu 24.2: System Information and Console Port Speed.........................................................21-4

Figure 21-4 Menu 24.2.1: System Maintenance: Information......................................................................21-4

Figure 21-5 Menu 24.2.2: System Maintenance: Change Console Port Speed............................................21-5

Figure 21-6 Menu 24.3: System Maintenance: Log and Trace.....................................................................21-6

Figure 21-7 Examples of Error and Information Messages ..........................................................................21-7

Figure 21-8 Menu 24.3.2: System Maintenance: UNIX Syslog ...................................................................21-7

Figure 21-9 Call-Triggering Packet Example .............................................................................................21-11

Figure 21-10 Menu 24.4: System Maintenance: Diagnostic.......................................................................21-12

Figure 21-11 WAN & LAN DHCP.............................................................................................................21-13

Figure 22-1 Telnet into Menu 24.5 ...............................................................................................................22-3

Figure 22-2 FTP Session Example................................................................................................................22-4

Figure 22-3 System Maintenance: Backup Configuration............................................................................22-7

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