Shulou(Shulou.com)06/01 Report--

In this issue, the editor will bring you about how to understand iptables and firewalld. 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.

Firewall technology is a technology that helps computer networks build a relatively isolated protection barrier between their internal and external networks by organically combining all kinds of software and hardware equipment used for security management and screening, in order to protect the security of user data and information.

Ensuring data security is the most important work after ensuring the availability of data. As a protective barrier between public network and intranet, firewall plays an important role in ensuring the security of data, and iptables and firewalld are the two most common firewalls.

Iptables

Iptables services refer to traffic policy entries used for processing or filtering as rules. Multiple rules can form a rule chain, which is classified according to the location of packet processing:

PREROUTING

INPUT

OUTPUT

FORWARD

POSTROUTING

Basic command parameters:

-p

-F

-L

A

-I num

-D num

S

-d

-I name of the network card

-o name of the network card

-p

Firewalld

Compared with traditional firewall management configuration tools, firewalld supports dynamic update technology and adds the concept of zone

The above is the editor for you to share how to understand iptables and firewalld, if you happen to have similar doubts, you might as well 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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