Easily build the most practical firewall for enterprises using Linux

Article Title: easily build the most practical firewall for enterprises using Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

As we all know, linux is a safe and stable operating system. Especially when it is used as a server operating system, it is definitely far better than the windows operating system in terms of stability and security! (And it's basically free! No one liked this !)

Here I will show you how to use redhat-linux to build the most practical firewall for enterprises!

Next, we will analyze what firewall functions are most commonly used by enterprise users.

1. Be secure. (Modify the Default policy to drop all packages destined for the local machine)
2. to enable the client and firewall to ping the Internet (one is in line with the usage habits; the other is to facilitate troubleshooting), it is also impossible for Internet users to scan the firewall (for the sake of security, the first one can do this)
3. If there is a server, it is very convenient for Internet users to access.
4. allow clients to access the Internet. (This is definitely important. Haha ...)

To sum up, I did the following experiment.

The topology of my experiment is shown below:

1. Start linux and create a firewall script file so that it can automatically apply these policies when restarting the computer ". See the following two figures:

 

 

2. Change the attributes of the newly created script file so that it can be executed (I will not map it here, I believe everyone will !) Copy to the/etc/rc. d/init. d folder. As shown in:

 

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