Search Again: Resolver Problems From: Tim Gleadle Date: Friday, January 7, 2000 Time: 1:01:00 pm Greetings Listers! I've recently been trying to set up a QuickDNS Pro server to replace our MacDNS server for internal name serving and to forward queries to our ISP (UUnet) for external names. It seems to work fine for internal names but is unable to successfully handle forwarding queries on to an external name server . Our network sits behind CheckPoint Firewall-1 4.0 but I don't believe that this is a simple firewall problem since both MacDNS and a Linux DNS work. Indeed nslookup even works from the box that is running QuickDNS. Our firewall consultants have run some snoop sessions for me and tell me that they observe packets leaving our firewall, arriving at their test DNS and even leaving their DNS. However they never arrive back at our firewall. They're not being dropped, they just don't arrive. However if I place QDNS outside the firewall it can resolve queries OK so the firewall is having some effect. I guess the question is what does QuickDNS do differently from MacDNS that makes Firewall-1 mangle its query packets so that the response packets get lost on the way back? Men and Mice support are looking into this (thanks Sigurdur), but any suggestions from the wider community gratefully received. Thanks Tim Gleadle IT Support Specialist Cambridge Antibody Technology Melbourn UK

Messages In This Thread: Resolver Problems by Tim Gleadle on Jan 7, 2000 at 1:01:00 pm