(Can you turn off HTML when posting to lists? TIA) * paul@routermanagement.com (Paul Gilbert) [Fri 27 Aug 2004, 14:49 CEST]:
I have a friend whom has a problem with we believe DNS. In this case the ISP is NTL. He has a stateful firewall and is running NAT you can see from the tcp dump below that he sends the query to one DNS server but another responds thus breaking the firewall state and therefore it never resolves.
Breaking the DNS protocol, too - cf. BIND's old "Response from unexpected source" syslog messages. http://archives.neohapsis.com/archives/incidents/2000-02/0032.html http://archives.neohapsis.com/archives/incidents/2000-02/0044.html Haven't seen one of those in a while, actually - has BIND gotten better at binding sockets to specific interface addresses (it has) or has it stopped reporting such instances?
Should the provider have the forwarding option on there servers or does he need to punch another hole in his firewall.
Punching holes is not likely to work as it's NAT that breaks... -- Niels.