- Written by Harsh Goyal
- Posted on December 21, 2020
- Updated on April 17, 2026
- 13226 Views
IPv4 Unicast Reverse Path Forwarding (uRPF) can help limit malicious IPv4 traffic on a network. uRPF works by enabling the router to verify reachability (routing) of the source IP address (SIP) in the packet being forwarded. If the SIP is determined to not be a valid address, the packet is dropped.