Port Forward Using iptables

Synonyms:

iptables

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Enable port forward

sudo vim /etc/sysctl.conf

net.ipv4.ip_forward = 1

sudo sysctl -p

Add port forward

Local IP

Local Port

Forward to IP

Forward to Port

sudo iptables -t nat -I PREROUTING -p tcp -i eth0 --dport 80 -j DNAT --to-destination 10.0.0.33:80
sudo iptables -t nat -I POSTROUTING -p tcp -o eth0 --dport 80 -d 10.0.0.33 -j SNAT --to-source 10.0.0.32

Save iptables (interactive)

sudo apt install -y iptables-persistent
sduo dpkg-reconfigure iptables-persistent
cat /etc/iptables/rules.v4
cat /etc/iptables/rules.v6

Show iptables

sudo iptables -t nat -L -v -n --line-numbers

Delete iptables

sudo iptables -t nat -D PREROUTING [N]
sudo iptables -t nat -D POSTROUTING [N]