Ubuntu – Change default port for remote desktop sharing 12.04 LTS

12.04networkingport-forwardingremote desktop

Basically I want to be able to access different computers remotely (all on Ubuntu 12.04 LTS) that are on the same wireless network. I've gotten this to work for one computer by forwarding port 5900 on my router, so I was thinking I could use forward port 5901 for my second computer. The problem is that I need to change the port that the second computer is listening on for remote desktop sharing (change default 5900 to 5901). Any ideas on how to do this? I am new to Ubuntu btw. Thanks.

Best Answer

Actually you can port-forward the external port 5901 into the internal port 5900 > IP: x and external port 5902 into the internal port 5900 > IP: y, and so on.

It is much simpler because you must only configure one thing -- your router -- and you won't have to remember different TCP ports when you want to reach the various PCs from inside your LAN.

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Use this set of iptables rules to set up your local computer as a NAT router:

iptables -P INPUT DROP  # drop every INPUT
iptables -P FORWARD DROP    # drop every FORWARD
iptables -A INPUT -i lo -j ACCEPT   # accept loopback-INPUT
iptables -A INPUT -i eth0 -j ACCEPT # accept eth0 INPUT
iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE   # NAT-Translation
iptables -A FORWARD -i eth0 -j ACCEPT   # accept FORWARD-Traffic from eth0
iptables -A FORWARD -i wlan0 -o eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT # accept FORWARD-Traffic as reply for existing connections
iptables -A INPUT -i wlan0 -m state --state ESTABLISHED,RELATED -j ACCEPT # allow the local computer to access the internet
iptables -A INPUT -i wlan0 -p icmp --icmp-type echo-request -j ACCEPT # allow pings on wlan0
echo "1" > /proc/sys/net/ipv4/ip_forward

Do not copy these rules without checking them first. Use a root-Shell (e.g. sudo -s) to apply these rules to iptables.

Remember to set your local computer as gateway for the remote one.

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