Avaya Configuring IP Utilities Uživatelský manuál stáhnout pdf (Strana 62)

Configuring IP Utilities

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Forwarding Name Queries over an Unnumbered Interface

NetBIOS cannot be configured directly on an unnumbered interface. Because of

this restriction, name query requests cannot be broadcast over an unnumbered

interface.

To forward name query requests over unnumbered interfaces, the network

administrator configures a static NetBIOS name entry to the proper NetBIOS

name server. In this way, name query requests will traverse the unnumbered

interfaces as unicast IP packets.

DNS Overview

The Domain Name System (DNS) is a distributed database system, with DNS

clients requesting host name/address resolution information from various DNS

servers. DNS is used with numerous types of networking applications and

protocols.

Specifically, DNS provides a directory service that allows client devices to

retrieve information from a server-based database. For the Internet, DNS enables a

device to obtain the IP address of a host based on the host’s domain name.

The Nortel Networks router can function as a DNS client or as a DNS proxy

server.

DNS Proxy Server

The DNS proxy server is a system solution that lets the router act as a DNS server.

DNS clients can configure an IP interface on the router as their DNS server. The

DNS proxy server on the router has a list of DNS servers to contact on behalf of

the client.

Using the DNS proxy server feature, a network administrator can statically

configure hosts to use the IP address of the DNS proxy server on the router. If the

DNS servers change or physically move, the administrator has to change only the

list of DNS servers on the router, rather than having to make the change on each

individual client.

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Avaya Configuring IP Utilities Uživatelský manuál Strana 62