Summary of the methods for opening ports in Linux and the summary of opening ports in linux

Summary of the methods for opening ports in Linux and the summary of opening ports in linux

Open Port method:

Method 1: Command Line
? ? ? ? ? ? ? ? 1. Open PORT command:/sbin/iptables-I INPUT-p tcp -- dport 8080-j ACCEPT
? ? ? ? ? ? ? ? 2. save:/etc/rc. d/init. d/iptables save
? ? ? ? ? ? ? ? 3. restart the service:/etc/init. d/iptables restart
? ? ? ? ? ? ? ? 4. Check whether the port is open:/sbin/iptables-L-n
? ??

? Method 2: directly edit the/etc/sysconfig/iptables File
? ? ? ? ? ? ? ? 1. Edit the/etc/sysconfig/iptables file: vi/etc/sysconfig/iptables
? ? ? ? ? ? ? ? ? ? Add content and save:-A RH-Firewall-1-INPUT-m state -- state NEW-m tcp-p tcp -- dport 8080-j ACCEPT
? ? ? ? ? ? ? ? 2. restart the service:/etc/init. d/iptables restart
? ? ? ? ? ? ? ? 3. Check whether the port is open:/sbin/iptables-L-n

However, I couldn't save it all the time. I found that iptables save is not required to directly modify the file on the internet, and I restarted iptables to reload the configuration. Iptables save writes the current iptables to/etc/sysconfig/iptables. I don't need to save the restart directly, so I suggest using method 2.

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Run the following command to check whether the port has a process daemon: grep, for example, 80 is the port number.
For example, netstat-NCLP | grep 80