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You can change your doamin name with the domainname
command.
Log in as root and use the syntax..............
> domainname <name.of.new.doamin>

If you use the domainname command all by itself
it echos your current domain name.

Simularly, you can change your host name with
the hostname command.

! ! ! The only real way to set the absolute 
domain name is to edit the /etc/resolv.conf
and add a line "domain <domain_name>" with a period
at the end. This says that this is the domain and not
a sub domain.

example
domain mydomain.com.

You may also choose to search more than one domain by 
adding the "search" option to the /etc/resolv.conf.

example
search mydomain.com	<- notes no period
search sun.com