What I have:
2 x internal DNS server (Svr2008R2) - configured to forward queries 2 x external DNS server
2 x external DNS server (RHEL6.4 - bind) - configured to forward queries to Google DNS (188.8.131.52, 184.108.40.206)
Clients computers are configured to lookup names using 2 x internal DNS servers.
What I want to know is how to trace the DNS forwarding queries when a user do a DNS lookup on client computer. Technically, I know that query will be sent to internal DNS servers, then internal DNS server will forward the query to external DNS server, then external DNS servers will forward the query to Google DNS servers.
But I need a way to trace DNS forwarding from client perspective.
Thanks in advance,