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Router Advertisement Link Identifiers (LinkID)
draft-pentland-mobileip-linkid-03.txt Brett Pentland – Monash University
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Outline Creates a link identifier to allow hosts to quickly recognise link changes New LinkID ND option for router advertisements Routers on a link negotiate a consistent LinkID using Router-to-Router messages from DetFastRA
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Main Changes from Version –02
Stable storage for Link Identifiers Monitor RAs to detect link joins and initiate LinkID change
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Running Code GD implemented router part as patches to radvd
Implemented alongside deterministic FastRA Shares router-to-router messaging and state machine No SEND (yet)
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LinkID Type Currently 48 bit random number Alternatives:
Longer random number Address Prefix
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48 Bit Random Identifier Pros: Very simple
Fits in a minimally sized 64-bit RA option Cons: Not globally unique High probability that there will be pairs of networks somewhere that use the same LinkID Requires “good” random numbers which be scarce
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64-bit Prefix Based Identifier
Pros: Can be globally unique Cons: Requires 128-bit RA option Need to ensure that prefix used as LinkID is still valid on the link May not be any global prefixes available – unique local prefixes?
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