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Forum Discussion
Possible very strange issues with DNS on FVS336Gv2 firewall
Hello, I am experiencing a very odd issue seemingly with the firewall here. There is a number of client PCs connecting through the FW and only two are suffering from this odd issue. Each time t...
Hi Alohadog,
Please go to Security -> Firewall -> Attack Checks and untick the "UDP Flood detection" if enabled. The thresholds may be a bit low for modern browsing which can cause legit traffic to be blocked... Most common symptom of UDP flood detection kicking in would be that DNS requests are no longer going through.
Thanks of the suggestion. It helped but did not solve the problem of the router falling over to another DNS. Instead of falling over in a day, it now takes 2 or 3 days. I need to find some time when I can take my network down, remove the router, and connect a computer directly to the modem and run some scripts to see what kind of responses I get to OpenDNS requests.
That still leaves the problem of the router falling over to an unknown DNS without any indication in either the status dialogs or the DNS log. I would bet the NSA loves that :-). Is there a bug report on that?
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