################################
iptables -A INPUT -p tcp --dport 80 -j ACCEPT //apache
iptables -A INPUT -p tcp --dport 443 -j ACCEPT //apache ssl
iptables -A INPUT -p tcp --dport 53 -j ACCEPT //dns - udp for large queries
iptables -A INPUT -p udp --dport 53 -j ACCEPT //dns - udp for small queries
iptables -A INPUT -p tcp --dport 953 -j ACCEPT //dns internal
iptables -A INPUT -p tcp --dport 1080 -j ACCEPT //dante socks server
iptables -A INPUT -d 136.201.1.250 -p tcp --dport 22 -j ACCEPT //sshd
iptables -A INPUT -d 136.201.1.250 -p tcp --dport 3306 -j ACCEPT //mysql
iptables -A INPUT -d 136.201.1.250 -p tcp --dport 8000 -j ACCEPT //apache on phi
iptables -A INPUT -s 136.201.1.250 -p tcp --dport 8080 -j ACCEPT //jboss for ejc
iptables -A INPUT -d 136.201.1.250 -p tcp --dport 993 -j ACCEPT //imaps
iptables -A INPUT -s 127.0.0.1 -p tcp --dport 111 -j ACCEPT //to speed up mail via courier. Identified via logging
iptables -A INPUT -d 136.201.1.250 -p tcp --dport 139 -j ACCEPT //samba
iptables -A INPUT -s 127.0.0.1 -p tcp --dport 143 -j ACCEPT //squirrelmail
iptables -A INPUT -p tcp --dport 4949 -j ACCEPT //munin stats
iptables -A INPUT -p tcp --dport 25 -j ACCEPT //incoming mail
iptables -A INPUT -p tcp --dport 3128 -j ACCEPT //squid
iptables -A INPUT -p udp --dport 161 -j ACCEPT //snmpd
iptables -A INPUT -p icmp -j ACCEPT //Allow ICMP Ping packets.
iptables -A INPUT -p tcp -m tcp --tcp-flags ACK ACK -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED -j ACCEPT
iptables -A INPUT -m state --state RELATED -j ACCEPT
iptables -A INPUT -j REJECT
#################################
iptables-save > rules-saved
iptables-restore rules-saved
เอาคำสั่ง iptables-restore <>
ตัวอย่างประมาณนี้ครับ โดยจะมี keyword 4 อันครับคือ pre-up post-up pre-down post-down
รายละเอียด ลอง $ man interfaces ดูครับ
auto eth0
iface eth0 inet static
address blablabla
netmask blablabla
gateway blablabla
post-up iptables-restore < rulesfile
pre-down iptables-save > rulesfile
