====== iptables初期 ======

  [root@linux ~]# iptables -L
  Chain INPUT (policy ACCEPT)
  target     prot opt source               destination
  RH-Firewall-1-INPUT  all  --  anywhere             anywhere
  
  Chain FORWARD (policy ACCEPT)
  target     prot opt source               destination
  RH-Firewall-1-INPUT  all  --  anywhere             anywhere
  
  Chain OUTPUT (policy ACCEPT)
  target     prot opt source               destination
  
  Chain RH-Firewall-1-INPUT (2 references)
  target     prot opt source               destination
  ACCEPT     all  --  anywhere             anywhere
  ACCEPT     icmp --  anywhere             anywhere            icmp any
  ACCEPT     ipv6-crypt--  anywhere             anywhere
  ACCEPT     ipv6-auth--  anywhere             anywhere
  ACCEPT     udp  --  anywhere             224.0.0.251         udp dpt:5353
  ACCEPT     udp  --  anywhere             anywhere            udp dpt:ipp
  ACCEPT     all  --  anywhere             anywhere            state RELATED,ESTABLISHED
  ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:ssh
  ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:http
  ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:ftp
  ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:smtp
  REJECT     all  --  anywhere             anywhere            reject-with icmp-host-prohibited
  [root@linux ~]#