On an Ubuntu server, the following command will create a rule in iptables that redirects any requests from port 80 to port 4567.

sudo iptables -t nat -I PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 4567  

To make this rule persist accross system reboots, open up the rc.local file

sudo vi /etc/rc.local  

and add the following line

iptables -t nat -I PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 4567