Easy to use Linux for the enterprise is the most practical firewall

We all know that Linux is quite safe, fairly stable operating system.

In particular it as a server operating system, which in absolute stability and security is much better than the windows operating system (and essentially free of Oh Oh, this point nobody doesn't like!) here I'll demonstrate how to build enterprise redhat-linux most practical firewall! Let's analyse analysis business users is the most commonly used firewall functionality. 1. to safety. (To modify the default policy to allow destination as native package drop off) 2. to allow the client and the firewall cannot ping pass outside the network (a to: conform to use habits; II to: facilitate troubleshooting), and is also not readily allow external users to scan to the firewall (for the sake of safety, the first has to do this) 3. If you have a server to be able to easily allow users to access the external network. 4. to allow the client to the Internet. (This is very important. Hehe. ) To sum up: I do the following experiment. Here is my experiment topography: 1. start linux, new firewall script files allow it to restart the computer to automatically apply the "strategy". The following two shown: 2. it will just create a new script file to change the properties so that it can perform (here I do not map it out, I believe we all!) and then copied to the/etc/rc.d/init.d folder. The following illustration: