Avaya P580 User Manual page 311

DNS Client on the
Avaya Multiservice
Switch
Document No. 650-100-700, Issue 1
The root server would then send a request to the master name server
requesting the translation. In small subdomains, a single DNS server may be
adequate for servicing the subdomain and be able to translate all DNS
requests. So the master name server may act as the individual name server
by providing the translations.
In large subdomains, a single DNS server may be inadequate to handle all
of the address translations. In these cases, the master name server may point
to other individual name servers. In this case, we are pinging the web server
www.avaya.com. Assume for this example that Avaya has a single DNS
server for the entire subdomain of avaya.com. The avaya.com DNS server
would use the IP address of the Avaya web server.
The client would then insert the IP address into the IP packets going to the
destination. In this example, it would put the IP address in the HTTP packet
going to the Avaya web site.
The benefit of using DNS is that you need only know the name of the server
instead of the IP address for which you are trying to communicate. Also, if
the IP address of the server changes, you need only update the DNS
database.
Many vendors provide DNS servers. Consult the DNS Server vendor's
documentation for information on configuring the DNS server. Virtually
every IP protocol stack includes DNS client capabilities. The Avaya
multiservice switch is a DNS client only.
The Avaya Multiservice switch has DNS client capabilities that work in
conjunction with the Command Line Interface (CLI). This feature is useful
for testing connectivity (ping and traceroute) as well as copying files from
TFTP servers.
It is not meant for use with the normal operation of the Avaya switch.
Therefore, you should not use a DNS name to specify the location of the
Avaya Multiservice switch's RADIUS server, SNTP Time server, etc. These
parameters must be specified as IP addresses. However, DNS does work for
the Avaya Multiservice Switch's Help File HTTP server.
In order for the DNS client functionality to work, it must be enabled on the
switch and at least one name server IP address must be specified.
The following DNS Client features are supported:
The DNS Client on the Avaya Multiservice switch is Stub Resolver
(i.e. it does not support Iteration). This means that referral answers
will be discarded. A Recursive DNS server must be used if you
intend on using FQDN for which the configured DNS servers do not
have resource records.
Configuring DNS Client
11-3