LevelOne GEP-2651 User manual

LevelOne

User Manual

GEP-2651

26-Port Web Smart Gigabit PoE Switch, 24

PoE Outputs, 2 x SFP/RJ45 Combo, 185W

Publication date: June, 2015

Revision A1

i

GEP-2651

User's Manual

26-Port Web Smart Gigabit PoE Switch

Release 6.23

trademarks of their respective companies

Publication date: June, 2015

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ii

About This Manual

Copyright

The products and programs described in this User’s Manual are licensed products of

Manufacture Technology, This User’s Manual contains proprietary information

protected by copyright, and this User’s Manual and all accompanying hardware,

software and documentation are copyrighted. No parts of this User’s manual may be

copied, photocopied, reproduced, translated or reduced to any electronic medium or

machine-readable from by any means by electronic or mechanical. Including

photocopying, recording, or information storage and retrieval systems, for any purpose

other than the purchaser’s personal use, and without the prior express written

permission of Manufacture Technology.

Purpose

This manual gives specific information on how to operate and use the management

functions of the GEP-2651

Audience

The Manual is intended for use by network administrators who are responsible for

operating and maintaining network equipment; consequently, it assumes a basic

working knowledge of general switch functions, the Internet Protocol (IP), and Simple

Network Management Protocol (SNMP).

CONVENTIONS

The following conventions are used throughout this manual to show information.

WARRANTY

See the Customer Support/ Warranty booklet included with the product. A copy of the

specific warranty terms applicable to your Manufacture products and replacement

parts can be obtained from your Manufacture Sales and Service Office authorized

dealer.

Disclaimer

Manufacture Technology does not warrant that the hardware will work properly in all

environments and applications, and marks no warranty and representation, either

implied or expressed, with respect to the quality, performance, merchantability, or

fitness for a particular purpose. Manufacture disclaims liability for any inaccuracies or

omissions that may have occurred. Information in this User’s Manual is subject to

change without notice and does not represent a commitment on the part of

Manufacture. Manufacture assumes no responsibility for any inaccuracies that may be

contained in this User’s Manual. Manufacture makes no commitment to update or

keep current the information in this User’s Manual, and reserves the righter to make

improvements to this User’s Manual and /or to the products described in this User’s

Manual, at any time without notice.

FCC Warning

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 when the equipment is

operated in a commercial environment. This equipment generates, uses, and can

radiate radio frequency energy and, if not installed and used in accordance with the

Instruction manual, may cause harmful interference to radio communications.

FCC Caution

To assure continued compliance (example-use only shielded interface cables when

connection to computer or peripheral devices). Any changes or modifications not

expressly approved by the party responsible for compliance could void the user’s

authority to operate the equipment. This device complies with Part 15 of the FCC

Rules. Operation is subject to the Following two conditions: (1) This device may not

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cause harmful

interference, and (2)

this device must accept any interference received, including interference that may

cause undesired operation.

CE mark

Warning

This is a Class B device, In a domestic environment, this product may cause radio

interference, in which case the user may be required to take adequate measures.

NOTE: Emphasizes important information or calls your attention to

related features or instructions.

W

ARNING

:

Alerts you to a potential hazard that could cause personal

injury.

C

AUTION

:

Alerts you to a potential hazard that could cause loss of

data, or damage the system or equipment.

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Table of Contents

Revision History .............................................................................................................................................. ix

INTRODUCTION ..................................................................................................................... 1

CHAPTER 1 OPERATION OF WEB-BASED MANAGEMENT ..................... 2

CHAPTER 2 SYSTEM CONFIGURATION ................................................... 6

2-1 System ..................................................................................................................................................... 6

2-1.1 Information ............................................................................................................................................. 6

2-1.2 IP .............................................................................................................................................................. 7

2-1.3 NTP ........................................................................................................................................................ 10

2-1.4 Time ....................................................................................................................................................... 11

2-1.5 Log ......................................................................................................................................................... 14

2-2 Green Ethernet..................................................................................................................................... 15

2-3 Ports Configuration ............................................................................................................................ 18

2-3.1 Ports ...................................................................................................................................................... 18

2-3.2 Ports Description ................................................................................................................................. 21

2-4DHCP ...................................................................................................................................................... 22

2-4.1 Server .................................................................................................................................................... 22

2-4.1.1 Mode ............................................................................................................................................. 22

2-4.1.2 Excluded IP.................................................................................................................................... 24

2-4.1.3 Pool ................................................................................................................................................ 25

2-4.2 Snooping .............................................................................................................................................. 27

2-5 Security ................................................................................................................................................. 29

2-5.1 Switch .................................................................................................................................................... 29

2-5.1.1 Users .............................................................................................................................................. 29

2-5.1.2 Privilege Level ............................................................................................................................... 31

2-5.1.3 Authentication Method ............................................................................................................... 33

2-5.1.4 HTTPs............................................................................................................................................. 34

2-5.1.5 SNMP ............................................................................................................................................. 35

2-5.1.6 RMON ............................................................................................................................................ 49

2-5.2 Network ................................................................................................................................................ 56

2-5.2.1 Limit Control ................................................................................................................................. 56

2-5.2.2 NAS ................................................................................................................................................ 59

2-5.2.3 ACL ................................................................................................................................................. 67

2-5.2.4 IP Source Guard ........................................................................................................................... 74

2-5.2.5 ARP Inspection ............................................................................................................................. 78

2-5.3 AAA ........................................................................................................................................................ 86

2-5.3.1 RADIUS .......................................................................................................................................... 86

2-6 Aggregation ......................................................................................................................................... 89

2-6.1 Static ...................................................................................................................................................... 89

2-6.2 LACP ...................................................................................................................................................... 91

2-7 Loop Protection ................................................................................................................................... 93

2-8 Spanning Tree ...................................................................................................................................... 95

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2-8.1 Bridge Setting ...................................................................................................................................... 95

2-8.2 MSTI Mapping ...................................................................................................................................... 98

2-8.3 MSTI Priorities .................................................................................................................................... 100

2-8.4 CIST Ports............................................................................................................................................ 101

2-8.5 MSTI Ports .......................................................................................................................................... 104

2-9 IPMC .................................................................................................................................................... 106

2-9.1 IGMP Snooping .................................................................................................................................. 106

2-9.1.1 Basic Configuration.................................................................................................................... 106

2-9.1.2 VLAN Configuration .................................................................................................................. 109

2-10 LLDP .................................................................................................................................................. 112

2-10.1 LLDP Configuration ......................................................................................................................... 112

2-10.2 LLDP-MED Configuration ............................................................................................................... 116

2- 11 PoE.................................................................................................................................................... 123

2- 11.1 Configuration .................................................................................................................................. 124

2- 11.2 Power Delay .................................................................................................................................... 126

2- 11.3 Scheduling ....................................................................................................................................... 127

3- 11.4 Auto Checking ................................................................................................................................ 129

2-12 MAC Table ........................................................................................................................................ 131

2-13 VLANs ............................................................................................................................................... 134

2-14 Private VLANs .................................................................................................................................. 138

2-14.1 VLAN Membership .......................................................................................................................... 138

2-14.2 Port Isolation .................................................................................................................................... 140

2-15 VCL .................................................................................................................................................... 141

2-15.1 MAC-based VLAN............................................................................................................................ 141

2-15.2 Protocol -based VLAN .................................................................................................................... 143

2-15.2.1 Protocol to Group .................................................................................................................... 143

2-15.2.2 Group to VLAN ......................................................................................................................... 146

2-15.3 IP Subnet-based VLAN ................................................................................................................... 147

2-16 VOICE VLAN ..................................................................................................................................... 149

2-16.1 Configuration ................................................................................................................................... 149

2-16.2 OUI .................................................................................................................................................... 151

2-17 QoS .................................................................................................................................................... 152

2-17.1 Port Classification ............................................................................................................................ 152

2-17.2 Port Policing ..................................................................................................................................... 155

2-17.3 Port Schedulers ................................................................................................................................ 157

2-17.4 Port Shaping..................................................................................................................................... 160

2-17.5 Port Tag Remarking ......................................................................................................................... 163

2-17.6 Port DSCP ......................................................................................................................................... 166

2-17.7 DSCP-Based QoS ............................................................................................................................. 168

2-17.8 DSCP Translation.............................................................................................................................. 170

2-17.9 DSCP Classification .......................................................................................................................... 172

2-17.10 QoS Control List Configuration ................................................................................................... 174

2-17.11 Storm Control ................................................................................................................................ 179

2-18 Mirror ................................................................................................................................................ 180

2-19 UPnP ................................................................................................................................................. 182

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2-20 Switch2go ......................................................................................................................................... 184

2-20.1 Switch2go setting ............................................................................................................................ 184

2-20.2 User Link Management ................................................................................................................... 186

2-20.3 Port Name Service ........................................................................................................................... 187

2-21 SMTP Configuration ....................................................................................................................... 188

CHAPTER 3. MONITOR .............................................................................. 190

3-1 System ................................................................................................................................................. 190

3-1.1 Information ......................................................................................................................................... 190

3-1.2 IP Status .............................................................................................................................................. 193

3-1.3 Log ....................................................................................................................................................... 195

3-1.4 Detailed Log ....................................................................................................................................... 197

3-2 Green Ethernet................................................................................................................................... 198

3-2.1 Port Power Savings ............................................................................................................................ 198

3-3 Ports .................................................................................................................................................... 199

3-3.1 Traffic Overview ................................................................................................................................. 199

3-3.2 Qos Statistics ...................................................................................................................................... 201

3-3.3 QCL Status .......................................................................................................................................... 203

3-3.4 Detailed Statistics .............................................................................................................................. 205

3-3.5 SFP Information ................................................................................................................................. 208

3-4 DHCP ................................................................................................................................................... 210

3-4.1 Server ............................................................................................................................................... 210

3-4.1.1 Statistics ...................................................................................................................................... 210

3-4.1.2 Binding ........................................................................................................................................ 211

3-4.1.3 Declined IP .................................................................................................................................. 212

3-4.1 Snooping Table .................................................................................................................................. 213

3-4.2 Detailed Statistics .............................................................................................................................. 214

3-5 Security ............................................................................................................................................... 216

3-5.1 Network .............................................................................................................................................. 216

3-5.1.1 Port Security ............................................................................................................................... 216

3-5.1.2 NAS .............................................................................................................................................. 221

3-5.1.3 ACL Status ................................................................................................................................... 226

3-5.1.4 ARP Inspection ........................................................................................................................... 228

3-5.1.5 IP Source Guard ......................................................................................................................... 229

3-5.2 AAA ...................................................................................................................................................... 231

3-5.2.1 RADIUS Overview ...................................................................................................................... 231

3-5.2.2 RADIUS Details ........................................................................................................................... 233

3-5.3 Switch .................................................................................................................................................. 238

3-5.3.1 RMON .......................................................................................................................................... 238

3-6 LACP .................................................................................................................................................... 247

3-6.1 System Status ..................................................................................................................................... 247

3-6.2 Port Status .......................................................................................................................................... 248

3-6.3 Port Statistics ...................................................................................................................................... 250

3-7 Loop Protection ................................................................................................................................. 252

3-8 Spanning Tree .................................................................................................................................... 253

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3-8.1 Bridge Status ...................................................................................................................................... 253

3-8.2 Port Status .......................................................................................................................................... 255

3-8.3 Port Statistics ...................................................................................................................................... 257

3-10 IPMC .................................................................................................................................................. 259

3-10.1 IGMP Snooping ................................................................................................................................ 259

3-10.1.1 Status ......................................................................................................................................... 259

3-10.1.2 Group Information ................................................................................................................... 261

3-11 LLDP .................................................................................................................................................. 263

3-11.1 Neighbour ........................................................................................................................................ 263

3-11.2 LLDP-MED Neighbour .................................................................................................................... 265

3-11.3 PoE ..................................................................................................................................................... 268

3-11.4 EEE ..................................................................................................................................................... 270

3-11.5 Port Statistics .................................................................................................................................... 272

3-12 PoE ..................................................................................................................................................... 274

3-13 MAC Table ........................................................................................................................................ 276

3-14 VLANs ............................................................................................................................................... 278

3-14.1 VLAN Membership .......................................................................................................................... 278

3-14.2 VLAN Port ......................................................................................................................................... 280

3-15 VCL .................................................................................................................................................... 282

3-15.1 MAC-based VLAN............................................................................................................................ 282

3-15.2 Protocol-based VLAN ..................................................................................................................... 283

3-15.2.1 Protocol to Group .................................................................................................................... 283

3-15.2.2 Group to VLAN ......................................................................................................................... 285

3-15.3 IP Subnet-based VLAN ................................................................................................................... 286

CHAPTER 4. DIAGNOSTICS ...................................................................... 287

4-1 Ping ..................................................................................................................................................... 287

4-2 Ping6 ................................................................................................................................................... 289

4-3 VeriPHY ............................................................................................................................................... 291

4-4 Traceroute .......................................................................................................................................... 292

CHAPTER 5. MAINTENANCE .................................................... 293

5-1 Restart Device .................................................................................................................................... 293

5-2 Factory Defaults ................................................................................................................................ 294

5-3 Software ............................................................................................................................................. 295

5-3.1 Download ........................................................................................................................................... 295

5-3.2 Software Image Select ...................................................................................................................... 296

5-4 Configuration .................................................................................................................................... 298

5-4.1 Save startup-config ........................................................................................................................... 298

5-4.2 Upload ................................................................................................................................................. 299

5-4.3 Download ........................................................................................................................................... 300

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5-4.4 Activate ............................................................................................................................................... 302

5-4.5 Delete .................................................................................................................................................. 303

CHAPTER 6 DMS-MANAGEMENT............................................................................. 304

6-1 Information ........................................................................................................................................ 304

6-2 Device List .......................................................................................................................................... 306

CHAPTER 7 DMS-GRAPHIC MONITORING ............................................................ 307

7-1 Topology View ................................................................................................................................... 307

7-2 Floor View .......................................................................................................................................... 308

7-3 Map View ............................................................................................................................................ 309

CHAPTER 8 DMS-MAUNTENANCE ........................................................................... 310

8-1 Floor Image ........................................................................................................................................ 310

8-2 Trouble shooting ............................................................................................................................... 311

8-3 Traffic Chart ....................................................................................................................................... 312

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Revision History

Release

Date

Revision

V6.23

06/11/2015

A1

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INTRODUCTION

Overview

In this user’s manual, it will not only tell you how to install and connect your network system

but configure and monitor the GEP-2651 through the web by (RJ-45) serial interface and Ethernet

ports step-by-step. Many explanations in detail of hardware and software functions are shown as well

as the examples of the operation for web-based interface.

The GEP-2651 series, the next generation Web managed switches from Manufacture, is a

portfolio of affordable managed switches that provides a reliable infrastructure for your business

network. These switches deliver more intelligent features you need to improve the availability of your

critical business applications, protect your sensitive information, and optimize your network

bandwidth to deliver information and applications more effectively. It provides the ideal combination

of affordability and capabilities for entry level networking includes small business or enterprise

application and helps you create a more efficient, better-connected workforce.

GEP-2651 Web Managed Switches provide 26 ports in a single device; the specification is

highlighted as follows.

 L2+ features provide better manageability, security, QoS, and performance.

 Support IPv4/IPv6 dual stack management

 Support SNMP v1/v2c/v3

 Support RMON groups 1,2,3,9

 Support IGMP v1/v2/v3 Snooping

 Support RADIUS authentication

 Support IP Source Guard

 Support DHCP Snooping

 Support ACL and QCL for traffic filtering

 Support 802.1d(STP), 802.1w(RSTP) and 802.1s(MSTP)

 Support LACP and static link aggregation

 Support Q-in-Q double tag VLAN

Overview of this user’s manual

 Chapter 1 “Operation of Web-based Management”

 Chapter 2 “System Configuration”

 Chapter 3 “Configuration”

 Chapter 4 “Security”

 Chapter 5 “Maintenance”

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Chapter 1 Operation of Web-based

Management

Initial

Configuration

This chapter instructs you how to configure and manage the GEP-2651 through the

web user interface. With this facility, you can easily access and monitor through any

one port of the switch all the status of the switch, including MIBs status, each port

activity, Spanning tree status, port aggregation status, multicast traffic, VLAN and

priority status, even illegal access record and so on.

The default values of the GEP-2651 are listed in the table below:

IP Address

192.168.1.1

Subnet Mask

255.255.255.0

Default Gateway

192.168.1.254

Username

admin

Password

admin

After the GEP2651 has been finished configuration the it interface, you can browse it.

For instance, type http://192.168.1.1 in the address row in a browser, it will show the

following screen and ask you inputting username and password in order to login and

access authentication.

The default username is “admin” and password is “admin”. For the first time to use,

please enter the default username and password, and then click the <Login> button.

The login process now is completed. In this login menu, you have to input the

complete username and password respectively, the GEP-2651 will not give you a

shortcut to username automatically. This looks inconvenient, but safer.

In the GEP-2651, allowed two or more users using administrator’s identity to manage

this switch, which administrator to do the last setting, it will be an available

configuration to effect the system.

NOTE:

When you login the Switch WEB/CLI to manager. You must first type the

Username of the admin. Password was blank, so when you type after the

end Username, please press enter. Management page to enter WEB/CLI.

When you login GEP-2651 series switch Web UI management, you can use

both ipv4 ipv6 login to manage

To optimize the display effect, we recommend you use Microsoft IE 6.0

above, Netscape V7.1 above or FireFox V1.00 above and have the resolution

1024x768. The switch supported neutral web browser interface

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NOTE:

AS GEP-2651 the function enable dhcp, so If you do not have DHCP server to

provide ip addresses to the switch, the Switch default ip 192.168.1.1

Figure 1 The login page

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Chapter 2 System Configuration

This chapter describes the entire basic configuration tasks which includes the System Information and

any manage of the Switch (e.g. Time, Account, IP, Syslog and NTP.)

2-1 System

You can identify the system by configuring the contact information, name, and location of the

switch.

2-1.1 Information

The switch system’s contact information is provided here.

Web interface

To configure System Information in the web interface:

1. Click Configuration, System, and Information.

2. Write System Contact, System Name, System Location information in this page.

3. Click Apply

Figure 2-1.1: System Information

Parameter description:

 System Contact:

The textual identification of the contact person for this managed node, together with

information on how to contact this person. The allowed string length is 0 to 128, and the

allowed content is the ASCII characters from 32 to 126.

 System name:

An administratively assigned name for this managed node. By convention, this is the node's

fully-qualified domain name. A domain name is a text string drawn from the alphabet

(A-Za-z), digits (0-9), minus sign (-). No space characters are permitted as part of a name.

The first character must be an alpha character. And the first or last character must not be a

minus sign. The allowed string length is 0 to 128.

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 System Location:

The physical location of this node(e.g., telephone closet, 3rd floor). The allowed string

length is 0 to 128, and the allowed content is the ASCII characters from 32 to 126.

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2-1.2 IP

The IPv4 address for the switch could be obtained via DHCP Server for VLAN 1. To manually

configure an address, you need to change the switch's default settings to values that are

compatible with your network. You may also need to establish a default gateway between the

switch and management stations that exist on another network segment.

Configure the switch-managed IP information on this page

Configure IP basic settings, control IP interfaces and IP routes.

The maximum number of interfaces supported is 8 and the maximum number of routes is 32.

Web Interface

To configure an IP address in the web interface:

1. Click Configuration, System, IP.

2. Click Add Interface then you can create new Interface on the switch.

3. Click Add Route then you can create new Route on the switch

4. Click Apply

Figure2-1.2: The IP configuration

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Parameter description:

IP Configuration

 Mode:

Configure whether the IP stack should act as a Host or a Router. In Host mode, IP traffic

between interfaces will not be routed. In Router mode traffic is routed between all

interfaces.

 DNS Server

This setting controls the DNS name resolution done by the switch. The following modes are

supported:

 From any DHCP interfaces

The first DNS server offered from a DHCP lease to a DHCP-enabled interface will be

used.

 No DNS server

No DNS server will be used.

 Configured

Explicitly provide the IP address of the DNS Server in dotted decimal notation.

 From this DHCP interface

Specify from which DHCP-enabled interface a provided DNS server should be

preferred.

 DNS Proxy

When DNS proxy is enabled, system will relay DNS requests to the currently configured

DNS server, and reply as a DNS resolver to the client devices on the network.

IP Interfaces

 Delete

Select this option to delete an existing IP interface.

 VLAN

The VLAN associated with the IP interface. Only ports in this VLAN will be able to access the

IP interface. This field is only available for input when creating an new interface.

 IPv4 DHCP Enabled

Enable the DHCP client by checking this box. If this option is enabled, the system will

configure the IPv4 address and mask of the interface using the DHCP protocol. The DHCP

client will announce the configured System Name as hostname to provide DNS lookup.

 IPv4 DHCP Fallback Timeout

The number of seconds for trying to obtain a DHCP lease. After this period expires, a

configured IPv4 address will be used as IPv4 interface address. A value of zero disables the

fallback mechanism, such that DHCP will keep retrying until a valid lease is obtained. Legal

values are 0 to 4294967295 seconds.

 IPv4 DHCP Current Lease

For DHCP interfaces with an active lease, this column show the current interface address, as

provided by the DHCP server.

 IPv4 Address

The IPv4 address of the interface in dotted decimal notation.

If DHCP is enabled, this field is not used. The field may also be left blank if IPv4 operation

on the interface is not desired.

 IPv4 Mask

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The IPv4 network mask, in number of bits (prefix length). Valid values are between 0 and 30

bits for a IPv4 address.

If DHCP is enabled, this field is not used. The field may also be left blank if IPv4 operation

on the interface is not desired.

 IPv6 Address

The IPv6 address of the interface. A IPv6 address is in 128-bit records represented as eight

fields of up to four hexadecimal digits with a colon separating each field (:). For example,

fe80::215:c5ff:fe03:4dc7. The symbol :: is a special syntax that can be used as a shorthand

way of representing multiple 16-bit groups of contiguous zeros; but it can appear only once.

It can also represent a legally valid IPv4 address. For example, ::192.1.2.34.

The field may be left blank if IPv6 operation on the interface is not desired.

 IPv6 Mask

The IPv6 network mask, in number of bits (prefix length). Valid values are between 1 and

128 bits for a IPv6 address.

The field may be left blank if IPv6 operation on the interface is not desired.

IP Routes

 Delete

Select this option to delete an existing IP route.

 Network

The destination IP network or host address of this route. Valid format is dotted decimal

notationor a valid IPv6 notation. A default route can use the value 0.0.0.0or IPv6 :: notation.

 Mask Length

The destination IP network or host mask, in number of bits (prefix length). It defines how

much of a network address that must match, in order to qualify for this route. Valid values

are between 0 and 32 bits respectively 128 for IPv6 routes. Only a default route will have a

mask length of 0 (as it will match anything).

 Gateway

The IP address of the IP gateway. Valid format is dotted decimal notationor a valid IPv6

notation. Gateway and Network must be of the same type.

 Next Hop VLAN (Only for IPv6)

The VLAN ID (VID) of the specific IPv6 interface associated with the gateway.

The given VID ranges from 1 to 4094 and will be effective only when the corresponding IPv6

interface is valid.

If the IPv6 gateway address is link-local, it must specify the next hop VLAN for the gateway.

If the IPv6 gateway address is not link-local, system ignores the next hop VLAN for the

gateway.

Buttons

 Add Interface:

Click to add a new IP interface. A maximum of 8 interfaces is supported.

 Add Route:

Click to add a new IP route. A maximum of 32 routes is supported.

 Apply:

Click to save changes.

 Reset:

Click to undo any changes made locally and revert to previously saved values.

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2-1.3 NTP

NTP is Network Time Protocol and is used to sync the network time based Greenwich Mean

Time (GMT). If use the NTP mode and select a built-in NTP time server or manually specify an

user-defined NTP server as well as Time Zone, the switch will sync the time in a short after

pressing <Apply> button. Though it synchronizes the time automatically, NTP does not update

the time periodically without user’s processing.

Time Zone is an offset time off GMT. You have to select the time zone first and then perform

time sync via NTP because the switch will combine this time zone offset and updated NTP time

to come out the local time, otherwise, you will not able to get the correct time. The switch

supports configurable time zone from –12 to +13 step 1 hour.

Default Time zone: +8 Hrs.

Web Interface

To configure NTP in the web interface:

1. Click Configuration, System, NTP.

2. Specify the Time parameter in manual parameters.

3. Click Apply.

Figure 2-1.3: The NTP configuration

Parameter description:

 Mode :

Indicates the NTP mode operation. Possible modes are:

Enabled: Enable NTP client mode operation.

Disabled: Disable NTP client mode operation.

 Server 1 to 5 :

Provide the NTP IPv4 or IPv6 address of this switch. IPv6 address is in 128-bit records

represented as eight fields of up to four hexadecimal digits with a colon separating each

field (:). For example, 'fe80::215:c5ff:fe03:4dc7'. The symbol '::' is a special syntax that can be

used as a shorthand way of representing multiple 16-bit groups of contiguous zeros; but it

can only appear once. It can also represent a legally valid IPv4 address. For example,

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'::192.1.2.34'.

 Buttons

These buttons are displayed on the NTP page:

Apply – Click to save changes.

Reset - Click to undo any changes made locally and revert to previously saved values.

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