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Breaking out of ssh

Break out

When you log into a terminal that is connected to a console port, you get the prompt from the device as if you were directly connected to it over rs232.

Amnesiac (ttyu0) 

if you type the following three keys one at a time (enter, tilde, period), you can break out of the ssh session: 
[Enter], [~], [.]

It looks like the following, where the green is the console session from a juniper router, and the blue is the terminal from a unix host that initiated the ssh session to the opengear console server.  
Amnesiac (ttyu0)

login: Connection to closed.

Other Controls

Other then terminating the ssh session, there are other commands you can send over the console session.  By pressing [Enter] and [~], you are prompted with the following help page to remind you of your options.  

login: ~?
Supported escape sequences:
 ~.   - terminate connection (and any multiplexed sessions)
 ~B   - send a BREAK to the remote system
 ~C   - open a command line
 ~R   - request rekey
 ~V/v - decrease/increase verbosity (LogLevel)
 ~^Z  - suspend ssh
 ~#   - list forwarded connections
 ~&   - background ssh (when waiting for connections to terminate)
 ~?   - this message
 ~~   - send the escape character by typing it twice
(Note that escapes are only recognized immediately after newline.)

So if you wanted to send a break to a starting cisco router, you would enter the three keys one after the other [Enter], [~], [B]