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Router Chokes-Requires Restart

Posted on 2008-06-17
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Last Modified: 2010-05-18
I have a Netgear FVS-318 v3 router with the latest firmware update. It runs a LAN with five computers, including a Win2k3 server running Mailtraq Mail Server software. This server naturally has the most traffic incoming, with hundreds of mesages per day( need I say, mostly spam). The servers and workstations all function fine, but sometimes at night, usually between 11pm and 2am, the router will choke( freeze). The WAN light works, indicating incoming traffic, but the LAN lights blink in unison, and not in response to the WAN traffic. Of course, the incoming mail stops and Internet access stops also. The only solution so far is to power cycle the router. But, that means that nothing is being received until the morning when I come in and discover the problem.  Any ideas why this is happening and how to prevent or fix it in a  more timely fashion?
Thanks for your help.
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Question by:PCGenieLA
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karampelas earned 750 total points
ID: 21826331
It sounds that some program is opening connections to too many hosts.
i seems like the connection tracking tables tend to overflow at which point the router no longer knows how to NAT the incoming packets...
Have you tried to check what the logs are saying??
It would also be a good Idea to run any traffic monitoring program on your router to see what is happening.
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by:PCGenieLA
ID: 21953580
I discovered that there actually were two problems; the routers choking and the Mailtraq service stopping. Magically, the router problem seems to have gone away, because for three days now it has not frozen. Maybe it was what I call a "shit storm", a swarm of spam emails that comes and goes and usually trashes everything. As for the Mailtraq. I used Wireshark to monitor the Maitraq server's NIC. I found that after a certain point Mailtraq stopped recognizing the incoming traffic as SMTP traffic. It would also deny connections because of socket limit. On a whim, I increased the number of simultaneous connections allowed and lowered the amount of time reserved for file maintenance to 30 minutes a day at 3am. So far, all has worked flawlessly.
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