The Lazy Networker

RACL is a type of ACL which will permit only the external traffic which is originated from inside and it will block all other external traffic . RACL will keep the session table of the outgoing traffic and it will check the external traffic with that particular session table .

Find below for the configurations

Step 1 : Create outbound ACL to reflect outgoing traffic

Step 2 : Create inbound ACL to evaluate the RACL

Verification

Thus router will block all outside traffic and permit only return traffic of the inside network.