Juniper-networks J4350 Manual do Utilizador descarregar pdf (Página 116)

J4350 and J6350 Services Router Getting Started Guide

For Common Criteria compliance , you must configure NTP to provide accurate

timestamps fo

r system log messages. For more information, see the Secure

Configuration Guide for Com m on C riteria a nd JUNOS-FIPS.

Network Setti

ngs

A Domain Name S

ystem (DNS) server on the network maintains a database for

resolving hostnames and IP addresses. Network devices can query the DNS server

by hostn a mes rather than IP addresses. The router accesses the DNS servers that are

added to the c

onfiguration to resolve hostnames in the order in which you list them.

If you plan to

include your router in several domains, you can add these do m ains to

the configuration so that they are included in a DNS search. When DNS searches

are requested, the domain suffixes are appended to the hostname s.

Default Gateway

A default gateway is a static route that is used to direct packets addressed to

networks no t explicitly listed in the routing table. If a packet arrives at the

Services Ro

uter with an address that the router does not have routing information

for, the router sends the packet to the default gateway. The default gateway

entry is always present in the routing and forwarding tables.

Backup Router

You can specify a backup router to take over when the routing protocol process

of the Services Router is not running, usually when the Service s Router is

booting, o

r if its routing protocol process has failed. Packets arriving at a

Services Router in this situation are routed to the backup router. When the

routing protocol process starts u p again, the address o f the ba ckup router is

removed f

rom the routing and forwarding tables of the Services Router. The

backup router m ust be located on the same subnet.

NOTE: To configure a backup router, you must use the CLI or J-Web configuration

editor. Y

ou cannot configure a backup router with J-Web Quick Configuration.

Loopback

Address

The loopb

ack address is the IP address of the Services Router. The loopback

address ensures that the Services Router provides an IP address to management

applications. Because it must always be available to ho sts attem pting to route

packets t

o the S ervic es Router, the loopback address resides on an interface that

is always active, known as the loopback interface (

lo0.0). Settingaloopback

address ensures that the Services Router ca n receive packets addressed to the

loopbac

k address as long as the router is reachable though any entry (ingress)

interface. In addition, ap pli cation s such as NT P, RAD IUS , and TACACS+ can use

theloopbackaddressasthesourceaddressforoutgoingpackets.

96 Basic Connectivity Overview

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