Iptables Firewall Open Common 22,53,80 port

With Iptables firewall
Iptables-f
# Allow packets to enter from Port 22
Iptables-a input-p TCP--dport 22-j ACCEPT
# Allow incoming packets from port 22 to return
Iptables-a output-p TCP--sport 22-m State--state established-j ACCEPT
Iptables-a output-p UDP--dport 53-j ACCEPT
Iptables-a input-p UDP--sport 53-j ACCEPT
#允许本机访问本机
Iptables-a input-s 127.0.0.1-d 127.0.0.1-j ACCEPT
Iptables-a output-s 127.0.0.1-d 127.0.0.1-j ACCEPT
#允许所有IP访问80端口
Iptables-a input-p tcp-s 0/0--dport 80-j ACCEPT
Iptables-a output-p TCP--sport 80-m State--state established-j ACCEPT
#保存配置
Iptables-save >/etc/sysconfig/iptables
Iptables-l

Iptables Firewall Open Common 22,53,80 port