View port usage and enable port commands on centos

Centos command to view port usage, for example, to view port 80 usage, use the following command:

Lsof-I TCP: 80

List all ports

Netstat-ntlp

1. Enable the port (take port 80 as an example)

Method 1:

/Sbin/iptables-I input-P TCP -- dport 80-J accept write Modification

/Etc/init. d/iptables save changes

Service iptables restart firewall, modification takes effect

Method 2:

VI/etc/sysconfig/iptables open the configuration file and add the following statement:

-A input-p tcp-M state -- state new-m tcp -- dport 80-J accept restart the firewall. The modification is complete.

2. Close the port

Method 1:

/Sbin/iptables-I input-P TCP -- dport 80-J Drop write Modification

/Etc/init. d/iptables save changes

Service iptables restart firewall, modification takes effect

Method 2:

VI/etc/sysconfig/iptables open the configuration file and add the following statement:

-A input-p tcp-M state -- state new-m tcp -- dport 80-J Drop restart firewall, Modification complete

3. view port status

/Etc/init. d/iptables status

View port usage and enable port commands on centos