iptable 샘플 > LINUX

# Firewall configuration written by lokkit
 # Manual customization of this file is not recommended.
 # Note: ifup-post will punch the current nameservers through the
 #      firewall; such entries will *not* be listed here.
 *filter
 :INPUT ACCEPT [0:0]
 :FORWARD ACCEPT [0:0]
 :OUTPUT ACCEPT [0:0]
 :RH-Lokkit-0-50-INPUT - [0:0]
 -A INPUT -j RH-Lokkit-0-50-INPUT
 -A FORWARD -j RH-Lokkit-0-50-INPUT

 # 관리자 컴퓨터
-A RH-Lokkit-0-50-INPUT -p tcp -m tcp -s 192.168.0.1 -j ACCEPT

 # 서비스포트
-A RH-Lokkit-0-50-INPUT -p tcp -m tcp --dport 80 --syn -j ACCEPT
 -A RH-Lokkit-0-50-INPUT -p tcp -m tcp --dport 25 --syn -j ACCEPT
 -A RH-Lokkit-0-50-INPUT -p tcp -m tcp --dport 110 --syn -j ACCEPT
 -A RH-Lokkit-0-50-INPUT -p udp -m udp --dport 110 -j ACCEPT
 -A RH-Lokkit-0-50-INPUT -p udp -m udp -s 192.168.0.140 --sport 53 -d 0/0 -j ACCEPT

 -A RH-Lokkit-0-50-INPUT -i lo -j ACCEPT
 -A RH-Lokkit-0-50-INPUT -p tcp -m tcp --syn -j REJECT
 -A RH-Lokkit-0-50-INPUT -p udp -m udp -j REJECT
 COMMIT



 #######  DNS 서비스 추가시 참조 ######
 # Firewall configuration written by system-config-securitylevel
 # Manual customization of this file is not recommended.
 *filter
 :INPUT ACCEPT [0:0]
 :FORWARD ACCEPT [0:0]
 :OUTPUT ACCEPT [0:0]
 :RH-Firewall-1-INPUT - [0:0]
 -A INPUT -j RH-Firewall-1-INPUT
 -A FORWARD -j RH-Firewall-1-INPUT
 -A RH-Firewall-1-INPUT -i lo -j ACCEPT
 -A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
 -A RH-Firewall-1-INPUT -p 50 -j ACCEPT
 -A RH-Firewall-1-INPUT -p 51 -j ACCEPT
 #mDNS
 -A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT
 -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
 -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

 -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 80 --syn -j ACCEPT
 -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 443 --syn -j ACCEPT
 -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 53 --syn -j ACCEPT
 -A RH-Firewall-1-INPUT -p udp -m udp --dport 53 -j ACCEPT
 -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 25 --syn -j ACCEPT
 -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 110 --syn -j ACCEPT
 -A RH-Firewall-1-INPUT -p udp -m udp --dport 110 -j ACCEPT

 # 관리자 컴퓨터
-A RH-Firewall-1-INPUT -m state --state NEW -s 192.168.0.1 -m tcp -p tcp -j ACCEPT

 -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
 COMMIT