This paper specifically addresses the second phase of the uRPF overhaul. Unicast RPF has been enhanced to allow it work on the ISP-ISP edge of the network. The new "loose check" enhancement removes the match requirement on the specific ingress interface, allowing uRPF to "loose" check packets. This allows an ISP peering router with multiple links to multiple ISPs to check the source IP address of ingress packets to see if they exist in the FIB. If they exist, then the packets are forwarded. If they do not exist in the FIB, then the packets fail and are dropped. This increases resistance against DoS/DDoS attacks that use spoofed source addresses based on RFC1918, Martian, and unallocated IP addresses.
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