Optimizing SSH for low speed links

Brad Hards bhards at bigpond.net.au
Thu Aug 8 12:04:58 EST 2002

Hash: SHA1

On Thu, 8 Aug 2002 12:00, Sam Couter wrote:
> Ian McCulloch <ianmcc at lorentz.leidenuniv.nl> wrote:
> > I have noticed that initiating an ssh connection on a slow link can take
> > a long time, I guess it depends on which authentication method you use
> Are you sure it's the link that is affecting the connection
> establishment? I have a slow machine at home on a reasonably fast
> network, and each time I establish an SSH connection it takes a while to
> crank out the session key. Once established, it's quite responsive.

If this is a machine without much randomness (eg you don't use the keyboard or 
mouse, because this is probably some data collection device at a remote site, 
right), then maybe that is the problem. Can you try the same configuration on 
a fast link? That would help identify the problem.

One solution might be to get a newer machine that has build in random 
generator, or change the sources of entropy.


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