The network configuration files are located in a number of places:
|Hostname & Gateway:||/etc/sysconfig/network|
All of this information should have already been setup during the installation phase of FC5. I have provided locations of the relevant files, should you choose to make modifications to them. I have also included personal links to each of these files, but they are password protected since they are only relevant to me and are only used to verify that the configuration for each of the files is correct (I have a tendency to forget my Name Servers).