What is antispoofing?

Answer 1

• Using spoofing, an intruder can fake the source address of his packets and make them look like they originated on the trusted hosts.

• The basic idea of anti-spoofing protection is to create a firewall rule assigned to the external interface of the firewall that examines source address of all packets crossing that interface coming from outside. If the address belongs to the internal network or the firewall itself, the packet is dropped.