Shulou(Shulou.com)06/02 Report--

In this issue, the editor will bring you about how to open and close ports in Linux. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

First, check which ports are opened netstat-anp

2. Close the port number:

Iptables-An OUTPUT-p tcp-- dport port number-j DROP

Third, hit the slogan of the beginning:

Iptables-An INPUT-ptcp-- dport port number-j ACCEPT

Save settings

Service iptables save

5. The following is how to use the linux open port command.

Nc-lp 23 & (Open port 23, i.e. telnet)

Netstat-an | grep 23 (check whether port 23 is open)

6. Linux Open Port Command every open port requires a corresponding listener

The above is how to open and close the port in the Linux shared by the editor. If you happen to have similar doubts, please refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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