Solution
Filtering a packet is when the packet is not processed normally, but is denied in some way. The computer processing the packet might simply ignore the packet completely, or where it is possible it might send a packet back to the sender saying the packet is denied.
In ingress filtering, packets coming into the network are filtered if the network sending it should not send packets from IP addresses of the originating computer.
In order to do ingress filtering, the network needs to know which IP addresses each of the networks it is connected to may send. This is not always possible. For instance, a network that has a single connection to the Internet has no way to know if a packet coming from that connection is spoofed or not.
Read more about this topic: Ingress Filtering
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