[iptables] 웹서버 방화벽 iptables 실습 (22, 80 Accept)

iptables -F

iptables -X

iptables -Z

iptables -P INPUT DROP

iptables -P FORWARD DROP

iptables -P OUTPUT DROP

iptables -A INPUT -i lo -j ACCEPT -m comment --comment "ACCEPT IN - LOOP BACK"

iptables -A OUTPUT -o lo -j ACCEPT -m comment --comment "ACCEPT OUT - LOOP BACK"

#ESTABLISHED, RELATED state

iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -m comment -comment "ACCEPT IN - ESTABLISHED, RELATED"

iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -m comment -comment "ACCEPT OUT - ESTABLISHED, RELATED"

#ICMP

iptables -A INPUT -p icmp -j ACCEPT -m comment --comment "ACCEPT IN - ICMP"

#ssh

iptables -A INPUT -s 10.10.30.28 -p tcp --dport 22 -j ACCEPT

#http

iptables -A INPUT -s 10.10.30.28 -p tcp --dport 80 -j ACCEPT

service iptables save

service iptables restart