[WWdevel] ssh connection multiplexing -- great stuff

[Sam H. <sh...@ma...>]

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Hi everyone,

OpenSSH 4.0 has the ability to multiplex multiple sessions on top of  
one connection. That means that there can be only one TCP session,  
only one key exchange, only one login, etc. for all your connections  
to a particular server. This speeds things up considerably! I find  
this particularly useful for remote editing of WeBWorK files on  
devel. It could also be useful for remote CVS activities.

The catch is you have to update your SSH client to version 4.0 or  
greater. I did it on Mac OS X with Fink. Most Linux distros supply it  
as well.

Instructions are at:

http://www.debian-administration.org/articles/290
http://gcc.gnu.org/wiki/SSH%20connection%20caching

I use Interarchy on the Mac, and though it does internal connection  
caching, it doesn't do multiplexing, and the cached connections time  
out after a while. I used to find it really annoying when I had to  
wait for a reconnect when going back to an Interarchy window after a  
while.

One catch with this setup is that if you put a "ControlMaster" line  
in your ~/.ssh/config file, you'll have to actually replace /usr/bin/ 
ssh with the new version, or Interarchy will choke while connecting.  
I renamed /usr/bin/ssh to ssh.ORIG and put a symlink to /sw/bin/ssh  
at /usr/bin/ssh.

Hope this is useful to you all.
- -sam
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