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Friday, October 19, 2007

Making your ssh server to act as a gateway by port forwarding

Ok, this is quick. My objective is to access the web, webmin and ssh of serverX. See below the text diagram.

[My Linux desktop]<-->[Routers]<-->[ssh server]<-->[routers]<-->[serverX]

Here's how.

-Create a file named config inside your $HOME/.ssh/

User root
LocalForward 20000
LocalForward 22000
LocalForward 20001

I'm accessing as root, and the IP Add is the IP of serverX, you may put the hostname if you have it on you host file or dns. Ok, when finished on the file, if I connect to the ssh server..

[root@my desktop ~]# ssh -l root ssh-server
root@ssh-server's password:
[root@ssh-server ~]#

After able to established an ssh connection, on my local terminal, those ports listed on the file will open.

tcp 0 0* LISTEN 26163/ssh
tcp 0 0* LISTEN 26163/ssh
tcp 0 0* LISTEN 26163/ssh
tcp 0 0 ESTABLISHED 26166/ssh
tcp 0 0 ESTABLISHED 26163/ssh
tcp 0 0 TIME_WAIT -
tcp 0 0 ::1:20000 :::* LISTEN 26163/ssh
tcp 0 0 ::1:20001 :::* LISTEN 26163/ssh
tcp 0 0 ::1:22000 :::* LISTEN 26163/ssh

Then you can just access those locally and you are going to be connected to the serverX via ssh. If you wish to access serverX web server, just open a the your browser with url

or if you wish to open the webmin, then type

Note: Don not dis engaged your ssh connection to the ssh server, else you wont be able to connect on those 2xxxx ports.

Well, its not an original trick, just found those by searching, I just need to compile for future reference.



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