Linux – Forward SSH through SSH tunnel

linuxport-forwardingsshssh-tunnel

My situation :

Me(localhost) -> Server A(ip:100.100.100.100) =>(server B(ip:192.168.25.100),server….)

i'm able to SSH into server since it has a true ip
if i then want to connect to server b, i would ssh server b with it's ip(192.168.25.100)

example:

from my pc: 

ssh user@100.100.100.100

then in 100.100.100.100, 

ssh user@192.168.25.100

this would get me to server B with ssh

what if i want to connect to server b directly?
how can i do that?

example:

from my oc:

ssh@192.168.25.100

i have tried the following:

ssh -L 22:localhost:22 user@100.100.100.100

without success

Best Answer

Your problem is in binding a listener to localhost:22; there's already an sshd listening on that. Tunnelling an ssh connection through an ssh connection is completely lawful, and I do it all the time, but you need to pick unused ports for your forwarding listeners.

Try

me% ssh user@100.100.100.100 -L 2201:192.168.25.100:22

then

me% ssh localhost -p 2201

You should end up on server B (unless something's already bound to me:2201, in which case, pick another port).

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