Snort mailing list archives
Re: Linux and switch problem???
From: Jim Burwell <jimb () broadvision com>
Date: Fri, 19 Jul 2002 13:44:37 -0700
OOPS. Just read this after I sent my reply to your previous post Twig. I see why spanning a 29XX/35XX could cause problems with high traffic rates. I wasn't aware how the 'switching fabric' architecture worked (basically copies packets into shared memory and signals other ports to forward those packets). I guess the shared memory buffers can get filled up if your monitor port can't pull the data fast enough for your buffer not to get filled. This can lead to 'slow downs' (and I assume dropped packets) on the ports which you're monitoring. Ack. Luckily, the traffic on the monitored port won't come close oversubscribing the monitor port, even when both directions are considered (monitored port is FD).
- Jim twig les wrote:
K, I don't know Extreme, but check this out before migrating to the 2912: http://www.cisco.com/warp/public/473/41.html#archXL As for the snort box doing any voodoo, I don't buy it. If there's a problem then it's on the switch and simply putting the switch config back to pre-slowdown config and seeing if the problem goes away should do it.
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Current thread:
- Linux and switch problem??? Daniel Curry (Jul 19)
- Re: Linux and switch problem??? twig les (Jul 19)
- Re: Linux and switch problem??? Daniel Curry (Jul 19)
- Re: Linux and switch problem??? twig les (Jul 19)
- Re: Linux and switch problem??? Daniel Curry (Jul 19)
- Re: Linux and switch problem??? Jim Burwell (Jul 19)
- Re: Linux and switch problem??? Daniel Curry (Jul 19)
- Re: Linux and switch problem??? Jim Burwell (Jul 19)
- Re: Linux and switch problem??? twig les (Jul 19)