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Unreachable_host is unavailable from local network, but it's available from reachable_host's network. This command creates a connection to unreachable_host through "hidden" connection to reachable_host.
There are 7 alternatives - vote for the best!
Of course you need to be able to access host A for this ;-)
If you can do better, submit your command here.
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That command is awesome :)
Also i would add that you can not only ssh to "unreachable_host", but any other command, for example telnet.
cool~!!! i like it~~