WRVS4400N causes my DNS server to time out

Folks,
I have a Fedora 11 box running behind a WRVS4400N router. From the box, standard network functionality such as ping, telnet, browsing, etc. works just fine. The problem is using the DNS server (Bind9) on the box. When this DNS server makes a request to external root servers, the connection just times out.
As you may know, when a DNS request is made by Bind, the destination port is 53 and the source port could be anything from 1024 to 60000.
I used tcpdump to trace the network packets. A UDP packet to port 53 of external root server is sent but the reply never comes back.
I replace the Linksys router with another DLink router, things start to work fine. When I trace the network packets, I see that the reply is coming through. This leads me to believe that there is something wrong with my Linksys router.
I am running the latest firmware on the router. I also did a factory reset to make sure that it is in a clean state.
Has anyone else seen such a problem? How did you fix it?
Thank  you in advance for your help.
Regards,
Peter

did you try port forwarding? you may forward the port that will work for your DNS servers.

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