This is one of the hardest parts to understand. I’ve never seen a complete list of rules written down in one Cisco manual. Some refer to them generally or explain some of them, but then miss others completely. The difficulty is that the rules always apply but (until now) you found them only by trial and error. Here are the rules you need to know:
ACL Rule 1 – Use only one ACL per interface per direction.
This makes good sense. You wouldn’t want to have several ACLs doing different things on the same interface. Simply configure one ACL . . .
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