CentOS View port occupancy and open port command details

CentOS View port occupancy commands, such as viewing 80 port occupancy Use the following command:

Lsof-i tcp:80

List all ports

Netstat-ntlp

1, open the Port method one:

/sbin/iptables-i input-p TCP--dport 80-j ACCEPT  Write modify


/etc/init.d/iptables  save modify


service Iptables Restart reboot  firewall, modify to take effect

Method Two:

Vi/etc/sysconfig/iptables  Open Configuration

File add the following statement:

<div class= "Codetitle" ><span><a style= "Cursor:pointer" Data= "25584" class= "copybut" id= "copybut25584" "Onclick=" docopy (' code25584 ') ><u> copy code </u></a></span> code as follows: </div><div class= "Codebody" id= "code25584" >-A input-p tcp-m State--state new-m TCP--dport 80-j  reboot firewall, modify complete
ACCEPT >

2, close the Port method one:

/sbin/iptables-i input-p TCP--dport 80-j DROP  Write modify
/etc/init.d/iptables  save modify

service Iptables re Start  reboot firewall, change takes effect

Method Two:

Vi/etc/sysconfig/iptables  Open Configuration

File add the following statement:

<div class= "Codetitle" ><span><a style= "Cursor:pointer" Data= "17298" class= "copybut" id= "copybut17298" "Onclick=" docopy (' code17298 ') ><u> copy code </u></a></span> code as follows: </div><div class= "Codebody" id= "code17298" >-a input-p tcp-m State--state new-m TCP--dport 80-j DROP  Restart Firewall, modified to complete
</div> ;

3. View port Status

/etc/init.d/iptables status