Sonicwall Pro 2040 DSN problems.
Posted on 2009-04-03
having an issue with Sonicwall 2040 and I belivev it's a DNS issue, just not sure how to approach the problem. I have one Sonicwall 2040, a bonded T1 and a DSL line as a fail over. On each interface I have configured all the ISP supplied info (ip, subnet and DNS info) and the lines are working fine. I have the fail over as a percentage-based and it all seems to work fine. The problem is that the DNS inquires are timing out when the user is on the DSL interface. If I do a dnslookup (Google, yahoo, cnn.com etc) they time out and I am forced to place the fail over on a basic active/passive fail over (no load balancing) so that the DNS inquires do not time out. The DNS server we use is a 2k AD server. I have the DNS of both ISPs in the forward tab in the DNS properties. It seems that when the users is on the DSL line, dns is very slow and often their web sites will time waiting for the DNS. If they are on the main T1 line, websites come up no problem.