1 Document your firewall rules Anyone who works on your IT security team should be able to tell very quickly what each of your firewall rules was intended to do by looking at your documentation At a minimum you need to keep track of the following data The purpose of the firewall rule The services it affects The users and devices it affects The date the rule was added When the rule should expire if it is temporary The name of the person who added the rule Some experts also recommend that you use categories or section titles to group similar rules together That can be especially helpful when it comes to determining the best order for your rules more on that below As you begin the process of finetuning and optimizing your firewall rules you should take the time to revisit your existing rules and make sure you have all the necessary documentation for each of them You may find that you are following some rules that were installed by default without anyone really understanding why you have them 2 Establish and follow a change procedure for firewall configuration Before you begin changing any of your existing firewall rules you should establish a formal process that you will use for any modifications if you dont already have such a process A typical change procedure might involve the following steps A change request process that business users can use to ask for alterations to the firewall configuration An assessment process with which the firewall team analyzes the risk and determines the best course of action to balance the business users needs with security needs A testing process that
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