Re: Ethernet falls into deep sleep.

From: Andrew Morton (akpm@osdl.org)
Date: Mon Jul 28 2003 - 15:07:19 EST


Michael Buesch <fsdeveloper@yahoo.de> wrote:
>
> I've a problem with my server/router, that I've seen on
> various kernels. currently I'm running 2.4.21, but I've
> seen the problem on 2.4.20 and 2.5.70, too.
> I'm using a 3com 3c509 ISA ethernet card.
>
> When this server stays a longer time (about one night, 12 hours)
> without network-traffic, it seems like the whole network-interface
> falls into a very deep sleep. It's very hard to wake the machine
> up.

This could be a router problem: some routers (Cisco?) decide that a host has
died if no traffic has been seen for a long time. Google for "vortex
sleepy nic" for some discussion.

I haven't seen any reports of this in a looong time. IIRC it was worked
around by pinging some remote host once per minute.

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