Optimizing SSH for low speed links
Alex Satrapa
grail at goldweb.com.au
Thu Aug 8 14:09:03 EST 2002
On Thursday, August 8, 2002, at 01:02 , Peter Barker wrote:
> Have you nailed the problem down to ssh, btw? Leaving all other
> variables
> the same, substitute rsync/rsh (temporarily :-) and see if it makes a
> difference?
Or even try "cat"ing a large file. I've had some experience with radio
links in the past (I've even configured a Cisco to tunnel IPX over IP
over PPP over radio - that was too much fun to have in one day!) and I
know that "reliability" is a word often used in glossyware for a reason.
You may find that reducing the MTU will help maintain communication over
that link - it reduces the amount of time that packets are in-transit
over the PPP link for (since they're smaller), and simultaneously
reduces the amount of retransmission that will occur due to stray gamma
rays or car ignitions.
The radio I was using (way back in ancient history) presented a serial
interface - so we ran PPP over the serial radio link. I know some
radios present an X.25 interface (let's take all the bad stuff about
radio, and stick all the bad stuff about OSI on top!), so you configure
the MTU (though I think they call it packet size) on the actual device,
not at the PPP level.
Alex
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