DNS configuration task list
264
IPLink Software Configuration Guide
23 • DNS configuration
address. DNS Relay agents maintain a cache of host names and IP addresses, much smaller than a DNS Server.
It acts as a liaison between the DNS Server and the DNS client
Advantages in configuring a DNS Relay in the IPLink are:
•
Network traffic is reduced since only a single query is sent to the DNS server although numerous users may
be requesting an IP address for the same host name
•
The DNS queries are localized between the Users and the IPLink which reduces congestion on the WAN
side of the IPLink
•
Multiple DNS servers can be consulted from the IPLink
The DNS resolver must be configured before you can use the DNS relay feature (see section
“Enabling the
DNS resolver”
on page 262 to enable the DNS resolver, if you have not already done so).
Do the following to enable the DNS relay feature:
Mode:
Configure
Example
: Enabling DNS relay
The following example shows how to enable the DNS relay feature.
IPLink>enable
IPLink#configure
IPLink(cfg)#dns-relay
Note
If a DHCP server profile has been set up, you can announce the IPLink as
domain name server to the DHCP clients as follows:
IPLink(cfg)#profile dhcp-server LAN
IPLink(pf-dhcps)[LAN]#domain-name-server <ip-address>
Where ip-address must be the IP address of the IPLink IP interface to which
the DHCP clients are connected.
Step
Command
Purpose
1
node(cfg)#dns-relay
Enables DNS relay feature