You do not get faster answers by marking your posts as urgent, it's not urgent to anybody except you.
Your DNS server address is the IP address of the box that does host name look ups for you. If you are not running your own DNS server, enter the IP addresses given to you by your ISP into /etc/resolv.conf Your domain name and host name will each go into /etc/hosts (if you don't have your own DNS server) and the host name usually also appears in /etc/HOSTNAME Also try the commands man resolv.conf and man hosts for more info.
What distribution are you using? Most Linux distributions provide tools to set these values.
Last edited by gilead; 12-27-2007 at 02:22 AM.