For those of you with access lists, I've made this small modification to the list that I originally got via Andrew Partan. You may wish to consider the change in respect to your own acls. In cisco format: access-list 112 deny ip host 0.0.0.0 any ! Loopback access-list 112 deny ip 127.0.0.0 0.255.255.255 255.0.0.0 0.255.255.255 ! RFC 1918 space access-list 112 deny ip 10.0.0.0 0.255.255.255 255.0.0.0 0.255.255.255 access-list 112 deny ip 172.16.0.0 0.15.255.255 255.240.0.0 0.15.255.255 access-list 112 deny ip 192.168.0.0 0.0.255.255 255.255.0.0 0.0.255.255 ! Test Network access-list 112 deny ip 192.0.2.0 0.0.0.255 255.255.255.0 0.0.0.255 ! IPv4 LinkLocal access-list 112 deny ip 169.254.0.0 0.0.255.255 255.255.0.0 0.0.255.255 --bill