I asked this same question a few weeks ago. I feel it possibly has something to do with the nachi worm and the way it fills route and arp tables (overflowing something in the nmc?) by pinging so many ip's. We have had success in limiting the number of failing nmc's by detecting infected customers and making them patch. Hope this helps... Kris McElroy extolled:

I have a TC that I am having trouble with. Here is the issue. I had an NMC card that went down so I took it out and put it back in worked fine for about a week. So I bought a new Hiper NMC and installed it worked great for about 10 days and went down. I took it out and popped it back in and it came back up, no configuration lost at all.

Chances of two NMC doing the same thing are slim. Does anyone have any other suggestions that I may try to figure this out.

Thanks,

Kris McElroy kmcelroy@duracom.net

Chief Technology Officer Duracom, INC. www.duracom.net

"I am always doing that which I can not do, in order that I may learn how to do it."