How does one add a port forward to an openSSH live connection?
kenneth at mail1.ttak.org
Mon Feb 23 08:32:50 MST 2009
The putty ssh client is an awesome tool. I also love the fact that
putty has a Linux, Windows and Mac client, so I can use it from most any
environment. One of the features I love is the ability to add a port
forward from a live connection. This way I can keep my currently
forwarded applications running, without having to kill everything then
reconnect. Can openSSH add a port forward to a live connection?
I found that I can create the initial port forward with:
# local forward
$ ssh [host] -L port:host:hostport
# remote forward
$ ssh [host] -R port:host:hostport
Once I have made the connection, is there a way to signal the ssh
process to add an additional port forward, similar to Putty?
The other feature I found, in Putty, is the "session keep alive"
feature, which you can also specify time between keep alives. As far as
openSSH, I found a "TCPKeepAlive" option, but I am not sure this does
the same thing as the session keep alive, and I don't see an option to
specify the time between keep alives.
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