I think that with an understanding of the configuration commands and rules you should be fine with access control lists. If your ACL isn’t working, first check that there is basic IP connectivity by pinging. Then check whether you have applied your ACL, that there are no typos, and whether you need to allow any IP traffic to pass (remember the implicit “deny all”). Some of the most important verification steps in the ACL troubleshooting process include:
- Verifying the ACL statistics
- Verifying the permitted networks
- Verifying the ACL interface and direction