Re: weird

[Aaron Keck <akeck () optimumdata com>]

Are you running spanning-tree protocol?  Consider the possibility of a 
switching loop, and a broadcast storm.  They will give identical 
symptoms to the ones your describing if someone happens to inadvertantly 
create a loop.


kenzo wrote:

> This weird thing happened at work.
> Everything was fine, then all of sudden the whole network freezes.
> All the swicthes and hub lights are blinking like there's no tomorow.
> So much traffic going on I can't even ping the computer accross me on the
> same switch.
> Then it stops and everything is back to normal. That happened twice.
> I use Ntop to watch for protocol usage to find infected computers(when that
> happens) and people using other protocols that the're not suppose to.  When
> this happens the box crashes.
> I tried using ethereal to see if I saw anything but of course it doesn't
> happen when I'm ready for it.
> I looked thru the traffic that I gathered from ethereal but none seem to
> really stick out.
> I'm not an expert, so the only thing that I know that will do the same thing
> is flooding the network with ramdom MAC addresses. Or maybe a major arp
> flooding or something.
> I haven't tried the arp flooding, but I know that the Mac flooding does the
> same thing.
>
> What could it be?  Did someone flood the network on purpose? If so, how do I
> track it?
> Or could it be that a bad Nic or device on the network just went crazy for a
> while. (That's what my boss seems to think.) Even then, how do I track it?
>
> Thanks.
>
>
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