Packet forwarding

hi,
I want to know if there is any program which can be run with user
privileges on linux which can listen to a port and forward all packets
arriving at that port to
a destination machine.

Lets say i have 3 computers.
X,Y,Z
X can connect to Y and Y can connect to Z.But X cannot connect to Z
X->Y->Z
And Y doesn't act as a gateway for X.
So i need a program which will run on Y an listen on say 3333 and
forward all packets to 3333 at Y to 4444 at Z.

Thank You

Manu J <(E-Mail Removed)> wrote:
> hi,
> I want to know if there is any program which can be run with user
> privileges on linux which can listen to a port and forward all packets
> arriving at that port to
> a destination machine.

> Lets say i have 3 computers.
> X,Y,Z
> X can connect to Y and Y can connect to Z.But X cannot connect to Z
> X->Y->Z
> And Y doesn't act as a gateway for X.
> So i need a program which will run on Y an listen on say 3333 and
> forward all packets to 3333 at Y to 4444 at Z.

Sounds like you could use "SSH Proxy Command" or
"SSH Port Forwarding", a google search on those should show dozens
of guides how to go on.

Good luck

--
Michael Heiming

Remove +SIGNS and www. if you expect an answer, sorry for
inconvenience, but I get tons of SPAM

On 13 Sep 2003 00:55:21 -0700, Manu J <(E-Mail Removed)> wrote:
> hi,
> I want to know if there is any program which can be run with user
> privileges on linux which can listen to a port and forward all packets
> arriving at that port to
> a destination machine.
>
> Lets say i have 3 computers.
> X,Y,Z
> X can connect to Y and Y can connect to Z.But X cannot connect to Z
> X->Y->Z
> And Y doesn't act as a gateway for X.
> So i need a program which will run on Y an listen on say 3333 and
> forward all packets to 3333 at Y to 4444 at Z.
>
> Thank You

try the 'redir' program

most distributions have it somewhere.

Here is Debian's version:

http://packages.debian.org/stable/net/redir.html

I use SSH to do the same job as this one. Like this:
ssh -g -L srcport:desthost:destport user@remotehost

This works fine for single port forwarding. But for multi-port services
like FTP and Real audio (Helix server), anyone knows how to do port
forwarding using SSH? Thanks a lot.

On Sat, 13 Sep 2003 13:03:22 +0200, Michael Heiming wrote:

> Manu J <(E-Mail Removed)> wrote:
>> hi,
>> I want to know if there is any program which can be run with user
>> privileges on linux which can listen to a port and forward all packets
>> arriving at that port to
>> a destination machine.
>
>> Lets say i have 3 computers.
>> X,Y,Z
>> X can connect to Y and Y can connect to Z.But X cannot connect to Z
>> X->Y->Z
>> And Y doesn't act as a gateway for X.
>> So i need a program which will run on Y an listen on say 3333 and
>> forward all packets to 3333 at Y to 4444 at Z.
>
> Sounds like you could use "SSH Proxy Command" or
> "SSH Port Forwarding", a google search on those should show dozens
> of guides how to go on.
>
> Good luck

FJY <(E-Mail Removed)> wrote:
> I use SSH to do the same job as this one. Like this:
> ssh -g -L srcport:desthost:destport user@remotehost

> This works fine for single port forwarding. But for multi-port services
> like FTP and Real audio (Helix server), anyone knows how to do port
> forwarding using SSH? Thanks a lot.

Try a google search for "ftpsshd", perhaps this is what you want.
Albeit I'd use scp/sftp for something like this.

BTW
Please stop top-posting.

--
Michael Heiming

Remove +SIGNS and www. if you expect an answer, sorry for
inconvenience, but I get tons of SPAM

yes, redir works fine with me.

raqueeb hassan
bunia, DRC