Ubuntu: Redirect Local Ports

gistfile1.sh

# Run these commands, and use the files below for the content

sudo nano /etc/network/if-up.d/my-redirect
chmod +x /etc/network/if-up.d/my-redirect
nano /etc/network/if-down.d/my-redirect-clearer
chmod +x /etc/network/if-down.d/my-redirect-clearer

my-redirect

#!/bin/bash
for i in $(sudo ifconfig  | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}'); do
        sudo iptables -t nat -I PREROUTING 1 -d $i -p tcp --dport 80 -j DNAT --to $i:8080
        sudo iptables -t nat -I PREROUTING 1 -d $i -p tcp --dport 443 -j DNAT --to $i:8443
done

my-redirect-clearer

#!/bin/bash
sudo iptables -F -t nat

Useful for forwarding / redirecting things like Jenkins and Jira from port 8080 to the normal http port 80, when you don't want to run an apache / nginx proxy.