[ubuntu-in] SSH Forwarding how to?

[Ravi Kumar]

Hi friends,
I have a server which cannot be accessed through Internet. Now, I want to
expose a service to internet, but in secure way. So I choose SSH Port
forwarding...
The scenario is:

Server A host a service i.e CVS on port 2401 (default_)
Server B has SSH service running.

Both A and B are in local network.

Now computer C from far world needs access to that service on A, so I want
to tunnel the communication between B and C for A-C communication.

Something such as : [A : cvs] <------------------> [B : sshd] <-----------
tunnel ----------------------------->[C]

Please guide me how can I enable ssh tunneling in such, I read many online
documents, but could not get the grip over the theory,
Also, for C i would like B as transparent. that is same port 2401 on B would
be forwareded to A:2401

again  that would be :   [A : 2401] <-----------------> [B : 2401]
<----------- ssh tunneling---------------------->[C]

Please guide me, also suggest me some more secure options for such, but only
opensource.
I want ssh authentication with public/private key [optional]


-- 
-=Ravi=-
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