The Cisco IOS has statefull firewall features like reflexive access lists. By using this feature, you can use your Cisco router as a second firewall (the choke point concept in Cisco firewall trainings) and increase your network security by layered approach.
You can use an access control list (ACL) for the filtering one way traffic, but what about the responding packages. You have to add an incoming ACL and it should include only sessions started f...
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