Switch to open access to the specified port under Linux

Little scum · Posted on 4/3/2023 11:28:38 AM

review

CentOS 7 prohibits an IP from accessing the server
https://www.itsvse.com/thread-10264-1-1.html

iptables firewall only allows certain IPs to access certain ports and specific websites
https://www.itsvse.com/thread-2535-1-1.html

CentOS7 View and turn off the firewall
https://www.itsvse.com/thread-7771-1-1.html

CentOS opens designated ports

CentOS 7.0 uses the firewall as the firewall by default, for example, to open port 8808, execute:

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thereinto

--zone means scope;
--add-port=8808/tcp indicates a specified open port in the format of [Port/Protocol]
--permanent means that it will take effect forever, if this parameter is not configured, the configuration will expire after restart.

Then restart the firewall

Login is visible.

To view the firewall rules, use the following command:

Login is visible.

Debian is open to designated ports

First, you need to install iptables, execute:

Login is visible.

Suppose you want to open port 8088, execute

Login is visible.

Then save the rule

Login is visible.

After the setting, the specified port has been opened, but it will be invalid after restarting.

install iptables-persistent

Login is visible.

Then execute the following two commands