Allied Telesis AR750S Manuale utente

Chapter 1

Getting Started

Establishing a Management Session with the Router ...................................... 1-2

Assigning an IP Address ................................................................................. 1-2

About Setting Routes ..................................................................................... 1-3

Checking Connections with PING .................................................................. 1-3

Changing a Password .................................................................................... 1-3

Using Command Line Help ............................................................................ 1-4

Using GUI Help .............................................................................................. 1-4

Special Feature Licences ................................................................................. 1-4

Setting System Parameters ............................................................................. 1-5

Saving Configurations Entered with the CLI ................................................... 1-5

Saving Configurations Entered with the GUI .................................................. 1-6

Troubleshooting Traffic Flow .......................................................................... 1-6

Software Upgrades ........................................................................................ 1-7

SNMP and MIBs ............................................................................................. 1-7

To Avoid Problems ......................................................................................... 1-7

For More Information ..................................................................................... 1-9

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Establishing a Management Session with

the Router

The router displays a login prompt after it completes a series of self-tests. For

details about these tests and messages, refer to the Hardware Reference.

The first step for configuring your router is to login using either its:

■command line interface (CLI) through the asynchronous management port

(asyn0), using a terminal or terminal server program. For instructions on

configuring Windows™ installation HyperTerminal terminal emulation

software, see the Hardware Reference.

■command line interface (CLI) by telneting to the default IP address

(AR750S, AR750S-DP, and AR770S). To telnet to an AR725 or AR745 router

you must first login to the router using the CLI and assign an IP address to

an interface.

■graphical user interface (GUI) through the default IP address (AR750S and

AR750S-DP). To use the GUI on an AR725 or AR745 router you must first

There is no GUI available on the AR770S.

For instructions on connecting to the router via the CLI or GUI, including the

default IP address, see the Installation and Safety Guide. If you experience

problems telneting to the router, see “Telnet Fails” on page 21-60 of Chapter 21,

Internet Protocol (IP).

For information about the CLI, see Chapter 2, Using the Command Line

Interface (CLI).

For information about the GUI, including detailed instructions on using the

GUI to connect to the router, see Chapter 3, Using the Graphical User Interface

(GUI).

Assigning an IP Address

To configure the router to perform IP routing, for example, to access the

Internet, you need to configure IP, including assigning IP addresses to at least

one of the router’s interfaces. You must also configure IP if you want to manage

the router from a Telnet session or with the GUI.

The AR750S, AR750S-DP, and AR770S have an IP address assigned by default.

For the default configuration, see the Installation and Safety Guide.

For step-by-step instructions on assigning an IP address to the router, see

“Assigning an IP Address” on page 21-10 of Chapter 21, Internet Protocol (IP).

To change the IP address for an interface, use the command:

set ip interface=interface ipaddress=ipadd mask=ipadd

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About Setting Routes

The process of routing packets consists of selectively forwarding data packets

from one network to another. Your router bases the decision to send a packet to

a particular network on information it learns dynamically from listening to the

selected route protocol, and from static information entered as part of the

configuration process. If the router does not know a valid route to the network

where a packet is addressed, it tries to discover one. If it cannot discover a valid

route, it does not send the packet.

For more information about routes and how to set IP routes, see “Routing” on

page 21-20 of Chapter 21, Internet Protocol (IP).

Checking Connections with PING

Ping polling allows the router to check whether it can reach another device. To

check a connection, use the command:

ping ipadd

If you receive a reply from the end destination, the physical and Layer 2 links

are functioning, and any difficulties are in the network layer or higher.

If pinging the end destination fails, check the router’s routes, and ping

intermediate network addresses. If you can successfully ping some network

addresses but not others, you can deduce which link in the network is down.

Note that if Network Address Translation (NAT) is configured on the remote

router, pinging devices connected to it may provide misleading information.

The ping command supports a number of protocols and can be configured

with default settings. For more information about using ping, see “Ping and

Trace Route” on page 21-37 of Chapter 21, Internet Protocol (IP).

Changing a Password

To prevent unauthorised access to the router, change the password for the

Manager user account as soon as possible.

If you are using the CLI, enter the command:

set password

If you are using the GUI:

1. Select Management > Users from the sidebar menu.

2. Select the Manager account and click Modify.

3. Enter the new password.

4. Check you have typed it correctly.

5. Click Apply. The router prompts you to log in again, using the new

password.

The password can contain any printable characters and must be at least six

characters long. For more information about passwords, see “Choosing

Passwords” on page 40-12 of Chapter 40, User Authentication.

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Using Command Line Help

Online help is available for all router commands. Enter the command:

help [topic]

If you do not specify a topic, a list of all available topics is displayed.

Also, typing a question mark at the end of a partially completed command

displays a list of the parameters that may follow the current command line,

with the shortest possible entry shown in uppercase letters. The current

command line is then re-displayed, ready for further input.

For information about upgrading help, see Chapter 2, What Commands does a

Feature Support?.

Using GUI Help

The GUI’s context-sensitive help system is displayed in a pop-up window that

covers the title of the GUI page. You can move the banner to any part of your

screen and/or resize it. To display help, click the Help button above the sidebar

menu or on the page for which you require assistance. The following types of

help are available:

■Click General Page Info for brief information about background and

process flow. This page is also displayed when you click the Help button.

■Click Page Element Info and roll your mouse over an element to view

information about that element.

To freeze the banner so that the help displayed does not change when you

move the mouse, press the Ctrl key. To unfreeze, press the Ctrl key again.

Note that element information is not available for most entries in tables. To

see descriptions of table columns, click Complete Help Page.

■Click Complete Help Page to see all available information in a separate

printable window, including information about elements.

Special Feature Licences

A special licence and password are required to activate features other than the

standard software version. Licences and passwords for special features are

separate from those for a standard software version.

A special feature licence can be a 30-day trial licence or a full licence (unlimited

time). Each licence is specific to a router serial number and cannot be

transferred from one router to another.

You must order passwords for special feature licences from your authorised

distributor or reseller. Specify the special feature licence bundle and the serial

number of the router on which the special feature licences are to be enabled.

See “Special feature licences” on page 5-16 of Chapter 5, Managing

Configuration Files and Software Versions for:

■information about which software features require a special feature licence

■instructions for enabling special feature licences

■more information about special feature licences

Help button

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Setting System Parameters

If you are using ISDN, you can use a global setting to set the router to defaults

appropriate for the territory where you operate. The command is:

set system territory

To aid in identifying the router you can name it, specify its location, and

identify the person responsible for administering it. These settings are

controlled by the commands:

set system name

set system location

set system contact

The system name is displayed as part of the command prompt, and all three of

the above settings are displayed in the output of the command:

show system

You can set the router’s time and date, which are displayed in log messages, by

using the command:

set time

For more information, see “System Identification” on page 4-3 of Chapter 4,

Configuring and Monitoring the System.

Saving Configurations Entered

with the CLI

To view the router’s current dynamic configuration, enter the command:

show configuration dynamic

If the router restarts (boots), any changes to the dynamic configuration are lost

unless you have saved them by entering the command:

create config=filename.cfg

The filename can be up to 28 characters long. The configuration file that you

create with this command records passwords in encrypted form, not in

cleartext.

To set the router to execute this configuration file when it restarts, enter the

command:

set config=filename.cfg

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Saving Configurations Entered

with the GUI

Configuration changes applied using the GUI can be saved as a configuration

file by clicking the Save button at the top of the sidebar menu. A pop-up Save

window gives you the option of saving to the current configuration file, to

another existing file, or to a new file. You can also choose to use this

configuration when the router restarts.

When the Save button is red, this indicates that changes have been made to the

configuration and not yet saved. If you attempt to exit the GUI without saving

the configuration, a pop-up window lets you choose whether or not to save it.

The configuration file you create with the GUI Save function records

passwords in encrypted form, not plaintext.

Troubleshooting Traffic Flow

If no traffic is passing through the router, or to or from the LAN, the DMZ or

both, try the following checks. Each check includes in parentheses how to find

relevant information in the GUI.

■Check that the router’s link to the LAN is functioning by checking the

interface status (Monitoring) and whether the link LED is lit. If the LED is

not lit, or the appropriate interfaces do not have an “active” status, then:

• Check that the port is enabled (Configuration > Port > Settings).

• Check that the IP address of the interface is still valid.

• Check that the cables are connected and functioning correctly.

■If you are using RIP, check the RIP configuration (Configuration > Internet

Protocol > RIP) as follows:

• Check that the RIP neighbour can reach the router, by pinging the

router from the RIP neighbour.

• Check that password and authentication settings are configured on the

neighbour as well as on this router.

■Check that the router is passing the correct DNS information to hosts on

the LAN if the router is a DHCP server. If the router is also acting as a

DHCP client, and therefore passing DNS information from another DHCP

server, check that this DHCP server is providing the router with the correct

information.

Save button

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Software Upgrades

Updates to the router’s software are available periodically. See the following

sections of Chapter 5, Managing Configuration Files and Software Versions.

For instructions and examples for upgrading software:

■Upgrade Overview

■Install Process

■Example: Upgrading to new software

■Example: Upgrading to a new patch file

■Upgrading the GUI

For descriptions of the different types of software, see Software Upgrades and

Patches.

SNMP and MIBs

You can remotely monitor many features of the router using Simple Network

Management Protocol (SNMP). The router supports SNMP Version 1

(SNMPv1), SNMP Version 2c (SNMPv2c) and Version 3 (SNMPv3). For

information about SNMP and configuring SNMP, see Chapter 54, Simple

Network Management Protocol (SNMP).

For a description of all MIBs (Management Information Bases) and MIB objects

supported by the router, see Appendix C, SNMP MIBs.

The router’s Documentation and Tools CD-ROM contains the MIB files that are

supported by the router, including the Allied Telesis enterprise MIB. The

Allied Telesis enterprise MIB files includes atrouter.mib, and other files with

filenames beginning with “at”.

To Avoid Problems

Backup software

files

Store a backup of the current router software. If the router software is

accidentally cleared from the router’s flash memory, you must reload the

software files. If your access to the Internet is via the router, then you need the

files on your LAN. You may want to keep a copy of the current files on a TFTP

server on your network. You can download router software from

www.alliedtelesis.com/support/.

Backup

configuration script

Store a backup of the latest configuration script in case the configuration file on

the router is accidentally deleted or damaged.

Backup router If your network has many routers, you may want to keep a backup router

ready in case one malfunctions. When you upgrade software on routers in the

network, upgrade the backup too. Store one current config script on the backup

for each router in your network, so that if a problem occurs you need only set

the configuration file with which it boots to match the router it replaces.

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Configure logging The logging facility stores log messages for events with a specified severity in a

log file. You can change the size of the log file, and the type of messages

recorded. You can configure the router to output log messages in several ways,

for example to a remote router with a specified IP address, or as an email to a

particular email address. The router can also receive log messages from

another router. Set the Logging Facility to log and forward key messages to

your network (see Chapter 59, Logging Facility). Regularly inspect the log file,

especially when difficulties arise.

Configure firewall Use the firewall to protect your network from several kinds of unwanted traffic

or deliberate attacks (see Chapter 45, Firewall).

The firewall facility is enabled with a special feature license. To obtain one,

contact an Allied Telesis authorised distributor or reseller.

Flash compaction If flash memory fills to a certain level, it automatically compacts itself to

recover space available from deleted files. You can also activate flash

compaction manually if desired.

Caution While flash is compacting, do not restart the router or use commands

that affect the flash file subsystem. Do not restart the router, or create, edit, load,

rename, or delete files until a message confirms that flash file compaction is

complete. Interrupting flash compaction can damage files.

Watch for software

updates

Updates are released periodically to improve the function of your router

software and to add new features. Watch for these at

www.alliedtelesis.com/support/updates/.

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For More Information

Refer to the following chapters for details about operating the router, including

full command syntax:

See this chapter... For information about...

Chapter 2, Using the

Command Line Interface (CLI)

the command line interface, including how to set aliases

to represent common command strings.

Chapter 3, Using the

Graphical User Interface (GUI)

the Graphical User Interface, including supported

browser/OS combinations, detailed connection

instructions, troubleshooting, and an overview of features

and navigation.

Chapter 4, Configuring and

Monitoring the System

specifying global system parameters, configuring the

router to email alerts, and monitoring system

functionality.

Chapter 5, Managing

Configuration Files and

Software Versions

upgrading the router’s software, creating configuration

files, supported servers, and loading files onto the router.

This chapter also describes how to use LDAP, and load PKI

certificates and CRLs onto your router.

Chapter 6, Managing the File

System

creating and editing files, including the supported

memory types.

Chapter 40, User

Authentication

authenticating users who log onto the router and

ensuring that only authorised login accounts are used.

Options include the User Authentication Facility, RADIUS,

TACACs or TACACS+.

Chapter 42, Port

Authentication

802.1x port based network access control.

Chapter 43, Secure Shell managing the router using SSH.

Chapter 54, Simple Network

Management Protocol

(SNMP)

and Appendix C, SNMP MIBs

and the MIBS folder on the

Documentation and Tools

CD-ROM.

using SNMP to manage the router remotely.

Chapter 56, Network Time

Protocol (NTP)

using NTP to synchronise your router’s time clock with

those of other network devices.

Chapter 57, Scripting creating, deleting and modifying configuration scripts.

Chapter 58, Trigger Facility setting up triggers to automatically run scripts at specified

times or events.

Chapter 59, Logging Facility log messages about network activity, including filters to

select and display a subset of the results.

Chapter 64, Test Facility using software to test whether the router’s hardware

functions correctly.

Appendix A, Messages information and error messages that the router may

display.

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