[clug] Diagnosing SSH performance problems [SEC=UNCLASSIFIED]

[Michael Cohen]

Antti,
  What you describes sounds like your machine is configured for too
high an MTU for the link. Try to lower your MTU and see if that fixes
it. If that is the issue ensure your firewall does not block ICMP MTU
discovery type messages so that your system is able to discover the
appropriate MTU.

Michael.

On Thu, Dec 10, 2009 at 5:18 PM, Roppola, Antti - BRS
<Antti.Roppola at daff.gov.au> wrote:
> Hi all,
>
> So I have an SSH problem where pushing data over an SSH connation gets
> me less than 9600 baud and numerous halts and timeouts. Pulling from the
> same host just rips along as you'd expect.
>
> Nothing obvious seen using "ssh -v". Nothing relevant leaps out at me in
> sshd_config.
>
> To me this suggests the issue is deeper down in the transport, network,
> data link of physical layer. Viz, I can't think of anything in OpenSSH
> that could be mis-configured to give asymmetric symptoms.
>
> Does this seem like a reasonable hypothesis?
>
> Cheers,
>
> Antti
>
>
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