Chapter 8 - Configuring Dns Client; Overview; Dns Client Support - Avaya Cajun P882 User Manual

Multiservice switch

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Recursive vs.

Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1

Configuring DNS Client

This chapter provides an overview of the Domain Naming System

(DNS) Client support and procedures for configuring DNS client

support on the Avaya Multiservice switch.

DNS is a distributed database of name servers which supply name-

to-address translations for DNS clients. The DNS servers collectively

direct DNS Clients to the DNS Server responsible for a Name to

Address mapping; and that Server provides the specific mapping

being requested.

There are three types of DNS servers:

The root name server — Located at the top of the DNS database

tree. It contains pointers to the master name servers for each of

the top-level domains. The root name servers handle the

domains such as .COM, .EDU, .GOV, etc.

The master name server — Located in the middle of the DNS

database tree. It contains pointers to the individual name servers

for each of the subdomains within its top-level domain.

The individual name server — Located at the bottom of the DNS

database tree. It contains detailed address information for the

local hosts in the subdomain.

The goal of DNS is to resolve a fully qualified domain name (FQDN)

to an IP address. This work can either be done by the DNS server or

the DNS client. These approaches are referred to as Recursive or

Iterative, respectively.

In the Recursive approach, a client sends a query to the server.

Assuming recursion is enabled, the server then looks for resolution

first locally in its own database, then in its local cache, finally by

going through the DNS tree until it finds a server that can give an

P550r P580 P880