Configuring Domain Name System (DNS) Characteristics

Changing the Time Limit

The domain name resolution time limit specifies the time that the access server waits before it resends a query to a name server. The range is from 1 to 10 seconds, and the default is 4 seconds.

To change the time limit, enter the command shown in the following example:

Local> CHANGE INTERNET NAME RESOLUTION TIME LIMIT 5

Changing the Retry Limit

The domain name resolution retry limit indicates the number of times that the access server resends queries to the same name server when looking for an Internet host. The range is from 1 to 5, and the default is 3.

To change the retry limit, enter the command shown in the following example:

Local> CHANGE INTERNET NAME RESOLUTION RETRY LIMIT 2

Changing the Name Resolution Mode

The name resolution mode describes where the access server searches for host name and address information. To change the name resolution mode, use the command shown in the following example:

Local> CHANGE INTERNET NAME RESOLUTION MODE LOCAL

Name Resolution Modes

The following table lists and describes the name resolution modes:

Mode

When the access server attempts to resolve a host

 

name or address, it searches:

 

 

Local

Local data, which is host name and address information that

 

users previously entered with the SET/DEFINE/CHANGE

 

INTERNET HOST command. Use local data when no name

 

servers are configured.

Remote

Learned data and remote name servers.

 

Learned data is name and address information that the access

 

server receives from name servers and enters in its cache. If the

 

access server fails to resolve the address with the learned data

 

in its cache, it queries the network name servers for remote data.

Ordered

Local data, then learned data and remote data from the network

(Default)

name servers. Local data takes precedence.

 

7-12 TCP/IP Network Characteristics