how to monitor traffic at port 53 (DNS)
- by Registered User
I am a bit confused with the abundant tcpdump tutorials on internet.
I am having a few of the virtual machines running on a virtualization server.Where I am debugging a problem.Port 53 is the one in problem.
I have a bridged setup where out of 4 LAN cards on the machine in question one is active and it is xen-br0
I want to check if there is any request coming on port 53 on the server by other machines on LAN in question. I also want to see if the guest operating systems on LAN or any other machine is sending traffic at port 53.Due to abundant messages being generated via tcpdump I am finding it difficult to grep the output at desired port.
So how can I use it if some one can give an example that would be helpful.
Thanks in advance.