*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT DROP [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT
-A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A OUTPUT -p icmp -j ACCEPT
-A OUTPUT -o lo -j ACCEPT
-A OUTPUT -p udp -m udp --dport 53 -j ACCEPT
COMMIT
对源地址开放
-A INPUT -s x.x.x.x -j ACCEPT
对目的地址开放
-A OUTPUT -d x.x.x.x -j ACCEPT