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BCP 84
RFC 8704
Title: Enhanced Feasible-Path Unicast Reverse Path
Forwarding
Author: K. Sriram,
D. Montgomery,
J. Haas
Status: Best Current Practice
Stream: IETF
Date: February 2020
Mailbox: [email protected],
[email protected],
[email protected]
Pages: 17
Updates: RFC 3704
See Also: BCP 84
I-D Tag: draft-ietf-opsec-urpf-improvements-04.txt
URL: https://www.rfc-editor.org/info/rfc8704
DOI: 10.17487/RFC8704
This document identifies a need for and proposes improvement of the
unicast Reverse Path Forwarding (uRPF) techniques (see RFC 3704) for
detection and mitigation of source address spoofing (see BCP 38).
Strict uRPF is inflexible about directionality, the loose uRPF is
oblivious to directionality, and the current feasible-path uRPF
attempts to strike a balance between the two (see RFC 3704). However,
as shown in this document, the existing feasible-path uRPF still has
shortcomings. This document describes enhanced feasible-path uRPF
(EFP-uRPF) techniques that are more flexible (in a meaningful way)
about directionality than the feasible-path uRPF (RFC 3704). The
proposed EFP-uRPF methods aim to significantly reduce false positives
regarding invalid detection in source address validation (SAV).
Hence, they can potentially alleviate ISPs' concerns about the
possibility of disrupting service for their customers and encourage
greater deployment of uRPF techniques. This document updates RFC
3704.
This document is a product of the Operational Security Capabilities for IP
Network Infrastructure Working Group of the IETF.
BCP: This document specifies an Internet Best Current Practices for the
Internet Community, and requests discussion and suggestions for
improvements. Distribution of this memo is unlimited.
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