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Host routing in a multi-prefix network

Document Type Replaced Internet-Draft (6man WG)
Expired & archived
Authors Fred Baker , Brian E. Carpenter
Last updated 2015-10-14 (Latest revision 2015-09-03)
Replaced by draft-ietf-6man-multi-homed-host
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Additional resources Mailing list discussion
Stream WG state Adopted by a WG
Document shepherd (None)
IESG IESG state Replaced by draft-ietf-6man-multi-homed-host
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This note describes expected IPv6 host behavior in a network that has more than one prefix, each allocated by an upstream network that implements BCP 38 ingress filtering, when the host has multiple routers to choose from. It also applies to other scenarios such as the usage of stateful firewalls that effectively act as address-based filters. This host behavior may interact with source address selection in a given implementation, but logically follows it. Given that the network or host is, or appears to be, multihomed with multiple provider-allocated addresses, that the host has elected to use a source address in a given prefix, and that some but not all neighboring routers are advertising that prefix in their Router Advertisement Prefix Information Options, this document specifies to which router a host should present its transmission. It updates RFC 4861.


Fred Baker
Brian E. Carpenter

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)