Bug#267342: kernel-image-2.6.8-1-686-smp: TCP/IP strangeness in 2.6.8
On Wed, Aug 25, 2004 at 02:14:58PM -0700, Nivedita Singhvi wrote:
> Christoph Hellwig wrote:
> >Could it be possible OpenBSD doesn't properly deal with the tcp window
> >scaling changes in 2.6.8? (http://lwn.net/Articles/92727/)
>
> Unless there is present in the path one of those broken
> routers (mangling the window scale option), it's likely
> something else. Also, nntp traffic tends to be small and
> unaffected by window sizes. Any way to tell if that is so?
>
> Any chance you could make the tcpdumps available, if
> this has not already been resolved?
Has been temporarily relieved by changing tcp_default_window_size.
(Indicated in updates to the debian bug report)
TCP dumps are available at
http://pakrat.is.an.evilplan.org:5198/267342/
Someone with access to the machine works at IBM.
He will drop you a note if you wish to sametime PD instructions.
Can also recreate on a non-SMP system if so desired.
>
> We had a problem with sshd and other apps hanging due
> to glibc changes and unsafe signal handling in daemons,
> but this seems like something else..
>
> thanks,
> Nivedita
>
>
> >>I have noticed strangeness with the 2.6.8 kernel on both 686-smp
> >>and k7.
> >>1) rsync from 2.6.8 to a 2.6.7 host hangs.
> >>2) ssh from 2.6.8 to a 2.6.7 host hangs.
> >>3) nntp from 2.6.8 hangs for 52 seconds before proceeding.
> >>4) ssh from Openbsd to 2.6.8 hangs after SSH2_MSG_KEX_DH_GEX_REQUEST
> >>
> >>In 1-2 the network topology is as follows
> >>2.6.8host <-ethernet-> OpenBSD <-openvpn-> OpenBSD <-ethernet-> 2.6.7host
> >>In 3 the network topology is as follows
> >>2.6.8host <-ethernet-> OpenBSD <-openvpn-> OpenBSD <-internet->
> >>nntp-server
> >>In 4 the network topology is as follows
> >>2.6.8host <-ethernet-> OpenBSD
>
>
--
K.D.
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