Connecting via two tunnel hops?

Hi. Any idea if it is possible to connect via two tunnels (I need to first access a gateway via SSH, where - via SSH - I login to our actual server). Maybe via start-up script? Or using a batch version of Putty?

thanks for any advice!

Regards

Christo

Hi,

You basically have three possibilities:

Tunnel from

localhost

to

host1

:

ssh -L 9999:host2:1234 -N host1

As noted above, the connection from

host1

to

host2

will not be secured.

Tunnel from

localhost

to

host1

and from

host1

to

host2

:

ssh -L 9999:localhost:9999 host1 ssh -L 9999:localhost:1234 -N host2

This will open a tunnel from localhost to host1 and another tunnel from

host1

to

host2

. However the

port 9999

to

host2:1234

can be used by anyone on

host1

. This may or may not be a problem.

Tunnel from

localhost

to

host1

and from

localhost

to

host2

:

ssh -L 9998:host2:22 -N host1
ssh -L 9999:localhost:1234 -N -p 9998 localhost

This will open a tunnel from

localhost

to

host1

through which the SSH service on

host2

can be used. Then a second tunnel is opened from

localhost

to

host2

through the first tunnel.