====== Port_forwarding ======

=====To port Forward general ports from a Linux box to a Windows Client=====
Problem: MySQL will only allow connections coming from localhost.<br>
Solution: Port Forward port 3306 through a SSH tunnel.
Connect to MYSQL on mysql.server.ie
 Putty:
 mysql.server.ie:22
 user = steve
 pass = usual one
 <br>
 SSH Tunnel:
 Source port: 3306
 Destination: localhost:3306
 (Local Port)

On the Windows Client:
 mysql -h localhost -u steveb -p
 pass = password
 Use database


=====To Port Forward a Windows/ Samba Network share via an Outside Linux Box onto a Windows PC=====
Tunneling using Putty:
In Tunnels Option ->
 Source Port: 127.0.0.2:139
 Destination: 136.x.x.x:139

In an Address Bar or Run box (Windows):
 \\127.0.0.2\sharename


=====Port Forwarding in Linux=====
This can also be automated in the ~/..ssh Directory

Has to be tested and confirmed:
 ssh -N -L 3333:136.xxx.xxx.xxx:5900 -x skynet.ie

===== Semi-Long Term Port Forwarding from Windows to Linux =====
Situation: you can connect to a Linux server on your LAN - however you need to access an external server through this linux server. You want to put a semi-permanent port forwarding in place.

You could use PuTTY using the method above - but putty would have to be open all the time.

Use portforwarding on the local linux server.

Login to the ssh server:
 ssh -f -g -L 3221:test.burkesys.com:22 -l username local.linux.pc sleep 600d
 <nowiki>//</nowiki> -f = fork into the background
 <nowiki>//</nowiki> -g = allow external clients from the LAN connect to 3221
 <nowiki>//</nowiki> -L = Local port forward
 <nowiki>//</nowiki> -l = username of local linuxpc
 
 telnet local.linux.pc 3221
 <nowiki>//</nowiki>try the above on your local windows pc etc. It should connect through on port 3221.
Note if the linux pc has a firewall - it wont work. To see if its working on the local linux pc:
 ps -eaf
 netstat -na
More Info: http://www.howtoforge.com/nfs_ssh_tunneling
===== Long Term Port Forwarding using iptables =====
Not tested yet.
I presume NAT will have to be used.