Example Packet Filtering Rules:

• Protect 128.105.0.0 network with Cisco router access control lists

• Apply rules from top to bottom: deny ip 128.105.0.0 0.0.255.255 any permit tcp any 128.105.1.1 eq 25 permit tcp any 128.105.1.2 eq 80 permit tcp any 128.105.1.3 eq 22 deny icmp any any redirect log permit icmp any 128.105.1.4 echo deny icmp any any echo log deny ip any any log