about testing SSH5.6 new feature.

Damien Miller djm at mindrot.org
Thu Oct 14 21:42:23 EST 2010

On Thu, 14 Oct 2010, Bai, Bin wrote:

> Hi, all
> Congratulations for the  latest OpenSSH release!
> Currently I'm writing the cases for testing the new feature. But this new feature is very complex for me:
> Ssh(1) connection multiplexing now supports remote forwarding with dynamic port allocation and can report the allocated port back to the user:
> LPORT=`ssh -S muxsocket -R0:localhost:25 -O forward somehost
> Can you tell me the way follow which I can basically test the new case on a Unix system(One connect to itself)?

ssh -Nnf -o ControlMaster=yes -o ControlPath=~/.ssh/_%r@%h:%p somehost

LPORT=`ssh -oControlPath=~/.ssh/_%r@%h:%p -R0:localhost:25 -O forward somehost

echo $LPORT

In practise, you would put the ControlMaster and ControlPort options in
~/.ssh/config and probably use ExitOnForwardFailure=yes and ControlPersist


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