i have installed a linux firewall iptables based on RH linux 9,with kernel ver 2.4.20-8.Is it possible to forward dns request via the internal lan card.

for eg

now client pcs are configured with dns as the actual dns of the isp.

Is it possible for me to replace the dns in the client systems to the ip address of the internal lan of the firewall.

In the Ip tables forward the dns requests from the internal lan ip to the dns of the ISP.