Bug#283107: telnet-connections to some hosts fail

[raoul@shuttle.de (Raoul Borenius)]

Hi Jurij,

On Sat, Apr 23, 2005 at 02:36:23PM -0400, Jurij Smakov wrote:
> 
> and so on. So it looks like _outgoing_ packets have bad TCP checksum and 
> probably are discarded by the other host. I believe that tcpdump captures 
> them after they hit the wire, so that leaves two possibilities: either 
> kernel constructs broken packets to be transmitted (which is somewhat 
> unrealistic, we would have plenty of bug reports in that case) or hardware 
> failure. Given that you see the bug on a number of different kernels, I 
> tend to believe the latter. Do you have an identical machine which you 
> could put in instead of testsparc and give it a go to eliminate this 
> possibility?

But how about the kernel from kernel.org? Everything seems fine with
that one.

We have some more UltraIIs, but they are in production use at the moment
so we can't play with those. I did some testing a few weeks ago when
the problem first showed up and found it on all Ultras with onboard hme.

Just to be shure I just tried kernel-image-2.4.27-2-sparc64 (2.4.27-2) on
one of our POP-Servers and the telnet-session hangs again...

The thing is, that not all telnet-connections fail:

- telnet to Linux-Host (try 'telnet mailgw1 25'): works
- telnet to Solaris-Host (try 'telnet esslingen'): works
- telnet to Ascend MAX4000 Access-Server (m-nas1): fails
- telnet to Cisco 7200 VXR (try 'telnet ol-gw'): fails

Thanks for your help!

Regards

  Raoul