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Wildcard MasksWildcard masks tell the router which parts of the address to look at and which to disregard. This would permit any host on network 172.16.5.x. In order to work out a wildcard mask simply write out the mask in full and then take that number away from 255. 34 access-list 12 permit 172.16.5.0 0.0.0.255 show ip access-lists show access-list 1 interface serial 0/0 ip access-list blockweb in ! ip access-list extended blockweb permit tcp host 192.168.1.1 host 172.16.1.1 eq 80 interface serial 0/0 access-group 1 in ! access-list 1 permit 192.168.1.1 interface serial 0/0 access-group 100 in ! access-list 100 permit tcp host 192.168.1.1 host 172.16.1.1 eq 80 Number255255255255- Mask255 255 192 0 Equals0 0 63 255
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