Problem setup SSH tunnel over multiple servers
 

Hello all,

I hope someone can fast give me some help what I do wrong ;-)

What I want to do are to build a SHH tunnel from my localhost to server1 (that i no problem) and when I get the wnat I build a SSH tunnel to server2, and when there build SSH tunnel to server3.
And with another terminal be able to ssh to my localhost and be forwarded directly to server 3.

I can not build the tunnel in "one command", I must build my tunnel i several steps because of the the end address is an internal-address and Server1 does not know that internal-address.

What I have done so far is

ssh -g -L 5436:localhost:22 server1.publicnet.com -l user

that brings me to server1 (no problems), the I want to continue from server 1 to server 2

ssh -v -L 5436:server1.publicnet.com:22 server2.localnet -l user

and from server2 to server3

ssh -v -L 1984:server2.localnet:22 server3.othernet -l user

But now when I test connect to my localhost:5436 then I end up only on server1

ssh -p 5436 user@localhost

What do I wrong???

it is not authentication problem, I have set up "key-authentication" and it works without problem. I have added "ForwardAgent yes" in my $home/.ssh/config

Please help!

Well, I'm not sure if this will work, but here's my guess:
That final statement should connect you to server3.

That does not work! but...
 

Thanks for your replay,

unfortunatly does it not work with your solution, but you helped me to gt one step closer to end-server. when I do SSH to my local port is stopping at server 2 now ;-)
Yeah, then I am half the way to my goal...

No, had to modify your suggestion a littel.
So now am I using as follow:

from Localhost ---> server1
test
ssh -v -L 5234:server2:22 server1.publicnet.com -l user
ssh -v -L 5235:ip-for-server3:22 server2.localnet -l user

taht brings me directly to server2 when I ssh to localport 5234.

But it is still one more step to get to my server3, and I am really confused because I the most radical and desperate solution to get my tird step to work without any success. for example:

ssh -A -p 5235 server3.othernet
ssh -L 5236:localhost:22 server3 -l user

None of above lets me to ssh localhost port and direct send me to server3

So, I am greatfull over more suggestions how it can be solved because I biggin to get really confused over it....

What happens when you try to ssh to port 5235?

It is not looking so good when I do it server2, I get...

ssh: connect to address 127.0.0.1 port 5235: Connection refused

And server2 does have access to server3 on ssh port?