Sounds like the issue I and one other person is having. See my posts DNS 
Forwarder Crashes

Lynn Grant wrote:
> Greetings, all...
>
> I'm having an odd problem...off-hand, it doesn't seem likely that
> M0n0wall is causing it, but I'm not sure, so I thought I'd see if anyone
> has run into it.
>
> I am running M0n0wall 1.3b2, but I experienced the same problem with
> 1.22.  The WAN port of my M0n0wall connects to the Internet (via a cable
> modem).  The LAN port connects to a switch.  Coming off the switch are a
> Windows box and a hub.  Connected to the hub is a Linux box, plus a few
> other Linux boxes that are usually turned off.
>
> Periodically, Windows stops finding websites.  Web requests time out and
> give me a "server not found message".  It doesn't matter if I am using
> IE6, IE7, Firefox, or Opera.  I thought it might be a DNS problem, but
> if I use NSLOOKUP on Windows, it seems to find anything I ask for just
> fine.  I can ping the router, and I can access files on the Samba server
> on the Linux box, so I have connectivity within the network.
>
> Meanwhile, over on the Linux side, everything is working fine. 
>
> BTW...I'm using DNS forwarding.
>
> I should also add that so far, the 1.3b2 version of M0n0wall seems to be
> working flawlessly.
>
> Thanks, 
>
> Lynn Grant
> lgrant at adamscon dot com 
>
>
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