iptablesによるアクセス制御
iptables -F
iptables -X
iptables -P INPUT DROP
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -p ICMP -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
iptables -A INPUT -p tcp --dport 1194 -s 123.123.0.0/24 -j ACCEPT
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE
iptables -A INPUT -j LOG --log-prefix "IPTABLES_INPUT_LOG: " --log-level=info
/etc/rc.d/init.d/iptables save
/etc/rc.d/init.d/iptables restart
cat /etc/sysconfig/iptables
/etc/rc.d/init.d/iptables status