iptables notes
Here are some notes I keep for myself when I play with iptables (I don’t use it often enough to remember how it works):
List all rules
# iptables -L
See the rules and their numbers
# service iptables status
Delete a rule
# iptables -D CHAIN NUM
E.g.:
# iptables -D INPUT 12
Add a new rule at the bottom of the chain
# iptables -A INPUT -i eth0 -p tcp --dport 8888 -j ACCEPT
Insert a new rule in a particular place
This inserts a rule in position 6; the rule that was formerly in 6th position will be bumped down (and all rules below it):
# iptables -I INPUT 6 -i eth0 -p tcp --dport 8888 \
-s 192.168.0.0/12 -m state \
--state NEW,ESTABLISHED -j ACCEPT
Last modified on 2012-03-09