How to use iptables to open specified ports under linux

The method to use iptables to open a specified port under Linux is: 1. Execute the [/sbin/iptables -I INPUT -p tcp --dport 8000 -j ACCEPT] command to open the port; 2. Restart the service; 3. Check whether the port is open.

Open the network port that allows external access through the following command:

Open port 8000

/sbin/iptables -I INPUT -p tcp --dport 8000 -j ACCEPT

Save the configuration

/etc/rc.d/init.d/iptables save

Restart the service

/etc/rc.d/init.d/iptables restart

Check whether the port is open

/etc/init.d/iptables status

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