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

Editor to share with you the use of linux iptables commands kernel package filtering and NAT management tools, I hope you will learn a lot after reading this article, let's discuss it together!

The iptables command is a tool that runs in user space on linux systems to configure kernel firewalls. It can set, maintain and check ipv4 packet filtering rules and manage network address translation (NAT) in the linux kernel.

The ipatbles command is only a linux kernel firewall management tool in user space, and the real function implementation is implemented by the linux kernel module. The corresponding kernel module must be loaded before configuring the server policy. Only ipatbles is supported in linux's 2. 6 kernel.

The ipatbles command only supports ipv4, and if the IP protocol is ipv6, you need to use a special management tool, ip6tables.

Syntax format: iptables [parameters]

Common parameters:

Reference example

Displays the current filter table of the kernel:

[root@linuxcool] # iptables-L

Displays the current nat table of the kernel:

[root@linuxcool] # iptables-L-t nat

Prohibit local access to the 192.168.20.20 address:

[root@linuxcool] # iptables-t filter-An OUTPUT-d 192.168.20.20-j DROP

Display the OUTPUT chain of the filter table:

[root@linuxcool] # iptables-L OUTPUT-t filter has finished reading this article. I believe you have some understanding of using linux's iptables command kernel package filtering and NAT management tools. Want to know more about it. Welcome to follow the industry information channel. Thank you for reading!

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