Firewall Rule Design Guidelines
Regardless of which type of rules you choose to implement, here are some guidelines for the creation of those rules:
Use a restrictive approach as opposed to a permissive approach for all interfaces and all directions of traffic. By using this as a starting point, you can then permit only traffic that you specify while denying everything else. This might take a little while to fine-tune because many administrators often discover additional required protocols for the functionality of their networks that may not have ...
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