[arch-general] SSH Tunnel doubts

[David J. Haines]

And yet, it doesn't touch on forwarding of anything other than X11 data.

To answer the original question, you're missing the host you're trying to
connect to, but I'll fill in the blanks

ssh -L X:host1:Y host2 means open a connection to host2, including shell,
and forward anything sent to localhost on port X to host1 on port Y. Host1
and host2 can be the same machine. This comes in useful for things like
forwarding VNC securely, e.g. ssh -L 60000:remotevncserver:5901
remotevncserver and then connecting to the vncserver at localhost:60000

ssh -R X:host1:Y host2 means open a connection to host2, including shell,
and then host2 should listen on port X for connections, which it will then
send back to your local host, which will forward the connection on to host1
on port Y.

In your example you're missing the host you're connecting to, but I can tell
you that:

ssh 192.168.1.200
ssh -L 1000:192.168.1.100:2000 192.168.1.100

when you start from 192.168.1.100 is functionally equivalent to

ssh -R 1000:192.168.1.100:2000 192.168.1.200

when you start from 192.168.1.100, in that both solutions will forward a
connection from 192.168.1.200:1000 to 192.168.1.100:2000 (I didn't use the
port 22 from your example, as that would imply that ssh wasn't running
there, so you'd need to use -p and other messiness).

Hope this helps,

David J. Haines
dhaines at gmail.com


On Mon, Jul 18, 2011 at 3:12 PM, Jeffrey Lynn Parke Jr. <
jeffrey.parke at gmail.com> wrote:

> On Mon, Jul 18, 2011 at 2:05 PM, Daniel. <danielhilst at gmail.com> wrote:
>
> > I have some doubts about traffic forwarding
> >
> > Supposing that my IP is 192.168.1.100
> > and the remote is 192.168.1.200
> >
> > is this -> ssh -R 1000:192.168.1.200:22
> > the same as this:
> > ssh 192.168.1.200
> > ssh -L 1000:192.168.1.100:22
> >
> >
> > ???
> >
> > --
> > *"Do or do not. There is no try"*
> > *  **Yoda Master*
> >
>
>
> You may want to read the wiki article for ssh.
> https://wiki.archlinux.org/index.php/SSH
>
> It is very detailed.
>
>
> --
> "Breath Deeply and Dream"
>