Thanks for reply . Can you guide me how to set up TCP dump on RHEL 4 and test . Can u explain this more so that I will calculate that.. " packet counts for each rule, which should help you to determine which rule is dropping or failing to forward the DNS packets." It will be helpful for me . Thanks saurabh On 1/26/07, Ted Phelps <phelps@xxxxxxxxxx> wrote:
Hi Saurabh, "Saurabh Mehrotra" writes: > Please find output of > > iptables -v -L I'm afraid I'm not clever enough to comprehend what your rules are trying to do. Also, I don't know what the IP address of trench1 is nor where the firewall is located in the network, so it's difficult to see which rules would be involved. The likely cause of your problem is that the DNS request or its reply is being dropped by your firewall. The easiest way to see which is happening is to have tcpdump listen to port 53 on 212.165.108.4 to see if the request is coming in and if a reply is going out. The iptables output you sent has packet counts for each rule, which should help you to determine which rule is dropping or failing to forward the DNS packets. Hope that helps, -Ted
