IP Address Filtering is a mechanism that determines what to do with network data packets based on their sender or destination address. In either case the packet is inspected by a network router or firewall and based on rules set by an administrator, the packet is passed on to next node on the network. If the rules say that packets with a particular address should not be sent on, then the packet is simply ignored. Which means it is not propagated via the current network route. It may still be delivered via another network route, as Internet traffic can follow multiple paths to destination.