SSH on high latency links. Re: [Patch] TCP MD5SIG for OpenSSH

[Roland Mainz]

On Fri, Jan 15, 2016 at 11:35 PM, Howard Chu <hyc at symas.com> wrote:
> Thomas ☃ Habets wrote:
>> On 15 January 2016 at 17:26, Roland Mainz <roland.mainz at nrubsig.org>
>> wrote:
>>>>>
>>>>> Don't these extra roundtrips further increase the latency of ssh
>>>>> connection setup (e.g. imagine a high-bandwidth&&high-latency satelite
>>>>> link) ? ssh is already a *PAIN* in that area, killing it's usefullness
>>>>> for applications like "Distributed make" because the time to setup the
>>>>> connection can be much longer than the command executed on the remote
>>>>> side.
>>>>
>>>> They would, but only when this non-default option was enabled.
>>>
>>> OK... are there any good ideas how to mitigate the latency effect ([1]) ?
>>
>> You could try mosh (https://mosh.mit.edu/).
>
> LINEMODE works too. https://github.com/hyc/OpenSSH-LINEMODE

Isn't that an improvement only for interactive mode ? My point was
that something like $ ssh "$LOGNAME at desthost" '/bin/true' # is
horrible slow compared to (Kerberised) rsh, and gets even worse on
high-latency links (problem is that the large number of roundtrips by
the ssh protocol makes the whole thing latency-sensitive to a high
degree).

----

Bye,
Roland

-- 
  __ .  . __
 (o.\ \/ /.o) roland.mainz at nrubsig.org
  \__\/\/__/  MPEG specialist, C&&JAVA&&Sun&&Unix programmer
  /O /==\ O\  TEL +49 641 3992797
 (;O/ \/ \O;)