Re: tcp across physical layers with burst blackouts?

Peter Samuelson (peter@wire.cadcamlab.org)
10 Dec 1999 15:55:59 -0600

[Matthias Andree <mandree@dosis.uni-dortmund.de>]
> after using some services (like ssh) over a line which has
> intermittent blackouts (dies off for a couple of seconds, sometimes a
> minute, then recovers) with an overall outage of 30% (ping -c 450), I
> find I'd like to tune the retransmission parameters so as to shorten
> the retransmission interval. (using 2.2.10 there, 2.2.13 here)

Similar thread came across l-k not long ago. Start reading at
http://www.kernelnotes.org/lnxlists/linux-kernel/lk_9911_02/msg01137.html
and see Andi Kleen's hacks for the kernel and for ssh at
http://www.kernelnotes.org/lnxlists/linux-kernel/lk_9911_02/msg01235.html

The idea is to allow a manual "kickstart" to a TCP connection, and to
bind this to an SSH key sequence. (*Automated* quick link recovery in
problematic without messing up congestion avoidance. *Manual* recovery
is conceptually similar to hitting "STOP" then "RELOAD" in Netscape,
i.e. it sometimes works wonders and you can't stop people from trying
it, one way or another, anyway.)

I didn't try the patches but they look good on (virtual) paper.

Peter

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