restrict port forwarding to only one port on one ip

Hello

I'm running sshd on a redhat machine connected to internet.

I would like to use it to permit clients connexions from internet to one server on my local network.

To do this, i use putty and configure tunnel.

Let's say i want to connect to 172.16.0.10 on port 23 from internet whereas my linux box is 172.16.0.1

Problem is i don't know how to prevent users from connecting to other machine by configuring their own tunnel. They could for example connect to port 137-139 on my windows machine by guessing the adresses 172.16.0.xxx

Is there a way to restrict it whithout setting up a firewall on my linux machine?

Thanks

Do you need help?

In addition to our free technical library, Pantek provides professional IT services to companies who utilize Open Source software: Learn more about Pantek's Technical Support offerings Place an order for 24/7/365 Technical Support here Learn more about Pantek, who we are, and what we do Chat with a Live Operator Related securityfocus.com Links bugtraq certification focus-bsd focus-ids focus-ih focus-linux focus-ms focus-sun focus-unix-other focus-virus forensics incidents libnet linux-secnews ms-secnews pen-test secpapers secprog sectools secureshell security-basics securityjobs sf-news vuln-dev webappsec Request more information about Pantek

Emmanuel RIZZI
ARILOG
103 rue Beaupoil
39210 DOMBLANS
03 84 44 66 66
03 84 44 62 00 Received on Wed Feb 5 18:49:47 2003