Firewall Quick Reference

Basic usage

List rules (with rule number)

iptables -L --line-number 

Append a output log rule for only 1 minute

iptables -A OUTPUT -m limit --limit 1/minute -j LOG --log-level 4 --log-prefix 'OutAllow1/m' 

Delete a rule by number

iptables -D INPUT 4 

Remove all iptables rules

iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT