Just some iptables cheatsheet :

show the current iptables:

iptables -L

check firewall service:

service iptables status

enable iptables service:

chkconfig –level 345 iptables on

save iptables


save iptables to /etc/sysconfig/iptables

service iptables save

Ban an IP:

iptables -A INPUT -s a.b.c.d -j DROP
# using a netmask:
iptables -A INPUT -s x.y.z.0/24 -j DROP

To delete a rule:

iptables -D INPUT -s a.b.c.d -j DROP
This entry was posted in server setup. Bookmark the permalink.