SSH Reusable Connections
Fast, persistent, reusable connections. Something like connection sharing. Something like: really fast
The transparent multi-hop connections can be very useful but you may find that it takes a second or two to establish each connection.
The good news is that if you can configure SSH to reuse an existing connection.
Step one - create a directory which SSH will use to keep track of established connections:
mkdir "%HOMEDRIVE%%HOMEPATH%\.ssh\tmp_controlmaster_sockets"
Step two - execute this only once to add two lines at the beginning of your SSH config:
set F="%HOMEDRIVE%%HOMEPATH%\.ssh\config"
rename %F% config.backup
echo ControlPersist 4h >> %F%
echo ControlMaster auto >> %F%
echo ControlPath "%HOMEDRIVE%%HOMEPATH%/.ssh/tmp_controlmaster_sockets/%h-%p-%r" >> %F%
echo. >> %F%
type %F%.backup >> %F%
Option ControlPersist automatically starts a background multiplexer when connecting to a host for the first time. This background connection can stay alive indefinitely or it can be set to close after a specified duration of inactivity.
Not working
I get an error: mm_send_fd: UsePrivilegeSeparation=yes not supported when trying to start second connection. And at the same moment, the first connection gets aborted.
Also, on my system ControlPersist directive is not supported so I had to disable it.