Stange sshd problem... bug?

[Pedro Bezunartea Lopez]

That did it! Thanks a lot! The thing is that my linux client box won't be
using window scaling, right? That will make certain connections, or should
I say large information transfers slower? I can live with that for this
machine.

I should also say that this affects to all connections, not just ssh.

Thanks again for your help! let's hope the kernel folks can fix this soon...

Pedro.

> Chris Rapier wrote:
>> Darren Tucker wrote:
>>> Try (as root):
>>> echo 0 >/proc/sys/net/ipv4/tcp_window_scaling
>>>
>>> and if that helps then read this for details:
>>> http://kerneltrap.org/node/6723
>
>> As a note: if this does work then its important to realize that you
>> haven't fixed the problem you have only identified what the problem is.
>> This really only swaps one set of problems for a much larger set of
>> problems (albeit one of performance rather than connection
>> establishment).
>
> That's true, and if this proves to be the reason then ideally the root
> cause (ie the network device that's not handling window scaling
> correctly) should be fixed.
>
> The catch is that this may be outside of the control of the folks
> affected by it.  In that case you have a choice of "fast and flaky" or
> "slow and reliable", and which is preferable would depend on what you're
> trying to do with it :-)
>
> As another aside: the assertion in that kerneltrap article that there's
> a bug in OpenBSD's pf and it its handling of TCP window scaling appears
> to be incorrect (although it is possible to misconfigure pf to cause
> this problem, see http://www.benzedrine.cx/pf/msg05117.html).
>
> --
> Darren Tucker (dtucker at zip.com.au)
> GPG key 8FF4FA69 / D9A3 86E9 7EEE AF4B B2D4  37C9 C982 80C7 8FF4 FA69
>      Good judgement comes with experience. Unfortunately, the experience
> usually comes from bad judgement.
>