Sunday, 29 July 2012

DNS

Domain Name Service (DNS):

Domain Name Service (DNS) resolves hostnames.

If you have a DNS server on your network, you need to add a few commands to make DNS name resolution work:

=> The first command is ip domain-lookup, which is turned on by default. It needs to be entered only if you previously turned it off (with the no ip domain-lookup command). The command can be used without the hyphen as well (ip domain lookup).

=> The second command is ip name-server. This sets the IP address of the DNS server. You can enter the IP addresses of up to six servers.

=> The last command is ip domain-name. Although this command is optional, it really should be set. It appends the domain name to the hostname you type in. Since DNS uses a fully qualified domain name (FQDN) system, you must have a full DNS name, in the form domain.com.

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