iptables

List iptables rulesiptables -t nat --line-numbers -n -L

Delete iptables rule
iptables -t nat -D PREROUTING 1

Ports redirection
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080
Traffic to port 80 will get redirected to port 8080