Strong Identity Multihoming using 128 bit Identifiers (SIM/CBID128)

Document Type Expired Internet-Draft (individual)
Author Erik Nordmark 
Last updated 2003-10-27
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document contains a rough outline of a potential solution to IPv6 multihoming in order to stimulate discussion. This proposed solution uses 126 bit identifiers which are hashes of public keys (know as Cryptographically-based Identifiers) which are created in an autonomous fashion by every node. When there is a need to verify whether a new locator should be used with an identifier than a public-key based challenge-response is used. The proposal allows locator rewriting by (border) routers, and ensures that the upper layer protocols can operate unmodified in a multihomed setting using the stable identifiers.


Erik Nordmark (

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