linux basic network

Here are some network configuration tools (depending on your system you might not have some of them)

Check their availabillity with the whereis command, ex:
[root@linux hack]# whereis netconf

netconf
 
A GUI interactive interface available on Redhat 6.1

linuxconf
 
A GUI interactive interface available on Redhat 6.1 which includes netconf configuration.

netconfig
 
A GUI step by step interface