interesting Proplem using Linux as a Router

[Omar Hasan]

Hi all,
   I ahave configure linux to act as a router.  I have
set up the iptables and forwarding and the DHCP
server.  when I ping an a public IP address such as
68.x.x.x for yahoo, I am able to ping.  However, when
I ping a domain name such as www.yahoo.com, I cannot
ping.  How can I have the IP address to resolve to a
domain name.

Regards,

Omar