how to create a tcp tunnel with "transparent reconnection"
Posted on 2008-10-05
ssh -f -N -L 2222:myremotemachine.com:3333 myremotemachine.com
Specifies that port 2222 on the local (client) host is to be forwarded to myremotemachine.com:3333.
This works by allocating a socket to listen to port 2222 on the local side. Whenever a connection is made to this port, the connection is forwarded over the secure channel, and a connection is made to myremotemachine.com:3333 from myremotemachine.com.
This works pretty well.
However, my client machine is inside a firewall that closes all connections after two hours. This is a hard constraint and it cannot be changed, and sending keep alive messages or anything else does not help.
the question is:
is there an equivalent to this: ssh -f -N -L 2222:myremotemachine.com:3333 myremotemachine.com
with the option of "transparently reconnecting" whenever the tunnel connection is broken?
by "transparently reconnecting" I mean that when the tunnel connection is broken,
the connection of the local application to localhost:2222 is not closed, nor is the connection from myremotemachine.com to myremotemachine.com:3333,
so that the application does not even notice that the tunnel connection was broken.
ps: is this a standard feature? does it have a proper name?
pss: i would prefer to install a standalone light software to both machine for this,
instead of complex and heavy solutions as installing a real vpn.
psss: one computer is running osx and the other is running mswindows with cygwin and open ssh server.