[c-nsp] Windows server hangs connected to 3750

[Vigar, Damien]

I've checked with our server admin and he's turned ip chimney off on all our servers.

> -----Original Message-----
> From: Sigurbjörn Birkir Lárusson [mailto:sigurbjornl at vodafone.is]
> Sent: Thursday, 27 November 2008 1:52 AM
> To: frnkblk at iname.com; Vigar, Damien; cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Windows server hangs connected to 3750
>
> One issue I've seen with 2003R2 is that it implemented Chimney (TCP checksum
> offloading) by default which has caused us endless grief with really bad TCP
> performance.  It seems network drivers shipped with 2003R2 were not really
> ready for this chance and many of them perform very badly even under little
> TCP load.
>
> You can try
>
> netsh int ip set chimney disable
>
> To turn it off and see if the situation improves
>
> BR,
> Sibbi
>
>
> On 26.11.2008 14:36, "Frank Bulk" <frnkblk at iname.com> wrote:
>
> > What NIC(s) do you have in the server?
> >
> > Frank
> >
> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net
> > [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Vigar, Damien
> > Sent: Tuesday, November 25, 2008 11:18 PM
> > To: cisco-nsp at puck.nether.net
> > Subject: [c-nsp] Windows server hangs connected to 3750
> >
> > Hi all,
> >
> > We are experiencing an issue with Windows 2003R2 servers connected to our
> > 3560/3750 switches via a 1000T SFP GBIC. The servers appear to hang,
> > responding to a ping but not to anything else. It looks to us like an
> issue
> > with the servers, but our server administrator insists that it must be the
> > GBIC/switch combination.
> >
> > We've put the servers in question back onto fast ethernet ports, and
> haven't
> > seen any problems in the meantime. Other sites' servers are running fine
> on
> > the same GBIC/switch combination.
> >
> > We've tried to find anything relating to this issue online, with no luck.
> > Any ideas on where to go next?
> >
> >
> > Cheers,
> >
> > Damien
> >
> >
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