RE: Firewalls in service provider environments

Here is the template we typically use (or a variant of it):

<-- snippet --> access-list 102 deny ip 10.0.0.0 0.255.255.255 any access-list 102 deny ip 172.16.0.0 0.15.255.255 any access-list 102 deny ip 192.168.0.0 0.0.255.255 any access-list 102 deny ip 0.0.0.0 0.255.255.255 any access-list 102 deny ip 127.0.0.0 0.255.255.255 any access-list 102 deny ip 224.0.0.0 15.255.255.255 any access-list 102 deny ip host 255.255.255.255 any

I typically also include traffic to/from: TCP/UDP port 0 169.254.0.0/16 192.0.2.0/24 198.51.100.0/24 203.0.113.0/24 Been wondering if I should also block 198.18.0.0/15 as well.