>> Set the IP address in /etc/sysconfig/network-scripts/ifcfg-eth0:
>> DEVICE=eth0
>> ONBOOT=yes
>> BOOTPROTO=static
>> in /etc/resolve.conf
>> nameserver (or whatever the Linksys router IP is)

If the firewall is, you don't want to make the IP address of
your machine also.

If you can't get the firewall to forward DNS queries, you can extract the
IP address(es) of the nameserver(s) it was given, and put them directly
into /etc/resolv.conf (nb: no 'e')