Iptables

Chains

INPUT
OUTPUT
FORWARD

Drop

Drop from Source

iptables -I INPUT -s 23.253.232.189 -j DROP

-I Insert
-A Append

-s Source
-d Destination

List

Current tables

iptables -L -v

-L List
-v verbose

with Line Numbers

iptables -L -n --line-numbers

List Chain

iptables -L INPUT -n --line-numbers

Delete

by Rule Number

iptables -D INPUT 3

by Rule Name

iptables -D INPUT -s 23.253.232.189 -j DROP

Delete All

Delete all rules

iptables --flush

Rules

Saving

iptables-save > /opt/firewall.conf

Restoring

iptables-restore < /opt/firewall.conf