raven  writes:
> Hi guys, i have this net topology:

quoted text
>

>

>                                       MAN

> [LOCAL_MACHINE] <------->[GATEWAY]<---->INTERNET<----------> [My

> EXTERNAL SERVER]

>

> So, i want to connect into my localmachine using ssh port forwarding

> on My EXTERNAL SERVER. Ofcourse the Gateway it's of my ISP, so i cant

> touch this.

> I can do just with SSH, or i have to use a VPN ?

> If the answer is: rtfm, i already do that...

I suppose you want to ssh to your localmachine when you are nowhere.

For that, you can ssh to your externalserver.com, and then ssh to your

localmachine.local.
On the local machine : 
  localmachine$ ssh -R5022:localhost:22 externalserver.com
You can automaticate this using some scripts, see the man of ssh and

ssh-keygen.
Now, externalserver listen on localhost:5022, and forward that to

localmachine:22.
On the externalserver, you can now connect to your localmachine :
  externalserver$ ssh -p 5022 localhost

  localmachine$
--

Guillaume Pinot                  http://www.irccyn.ec-nantes.fr/~pinot/
``Computers are good at following instructions, but not at reading your

mind.'' -- Donald E. Knuth, the TeXbook
()  ASCII ribbon campaign      -- Against HTML e-mail

/\  http://www.asciiribbon.org -- Against proprietary attachments