Iptables Cheatsheet

# View iptables
sudo iptables -nvL

# Add a rule
iptables -A INPUT -p tcp --dport 80 -j ACCEPT       # Append to end of chain
iptables -I INPUT 1 -p tcp --dport 80 -j ACCEPT     # Insert at position 1 in chain

# Delete a rule
iptables -D INPUT 5         # 5 is index 5 in the INPUT-chain

# Replace a rule
iptables -R INPUT 1 -p tcp -s 192.168.0.0/24 --dport 80 -j ACCEPT # Replace rule at index 1

# Save and load
iptables-save > iptables.dump
iptables-restore < iptables.dump