1. DNA design team update Brett Pentland – Monash University

2. Progress Unable to come to agreement on a single solution Discussions have centred on the pros and cons of available techniques

3. Assumptions Routers on a link can hear each other Hosts that can connect to multiple links from one interface can distinguish packets from the different links DNA is complete when link identity decision is made and prefix obtained

4. The Problem RS/RA exchange –Putting the right information in the exchange so that an accurate decision can be made Getting the RA fast

5. RS/RA Exchange Adding something to the RA –Explicit Link Identifier Random Prefix-based –Complete RA Adding something to the RS to ask a question –Prefix-based Landmark –Priority Landmark –Hybrid Landmark

6. Getting the RA quickly Fast Router Discovery (RA caching) Simple FastRA Deterministic Fast RA Hash-based deterministic Fast RA Probabilistic Fast RA

7. Explicit Link Identifier - Random Pros Easy for host to recognise link reliably Doesn’t require solicitation to be useful Independent of prefix changes on link Cons Needs agreement between routers Extra option in RAs

8. Explicit Link Identifier - Prefix Pros Easy for host to recognise link reliably Doesn’t require solicitation to be useful No extra options if there is a common prefix Cons Needs agreement between routers Link Identifier may need to change as prefixes on the link change

9. Complete Router Advertisement Pros Easy for host to recognise link reliably Small RAs if all routers on a link have the same prefixes No changes to solicitations Solicitations not necessary Cons RAs carry extra prefixes if routers have non-matching prefix sets Potential for large increase in RA size

10. Requested Landmark Pros Simple RAs (yes/no flags) No router negotiations –Just listen to RAs Cons Prefix option added to RSs Needs solicitation to be useful

11. Priority Landmark Pros Confirms bi- directional reachability of default router if no movement Cons Relies on RA scheme that ensures that first response is from requested router if present Adds router address option to RSs

12. Hybrid Landmark Pros Simple RAs (yes/no flags) No router negotiations –Just listen to RAs Confirms bi-directional reachability of default router if no movement Allows any router to respond giving definitive answer to link-change question Cons Adds router address option to RSs

13. Fast Router Discovery Pros Potentially very fast No changes to routers Cons Link specific Some security concerns

14. Simple Fast RA Pros Simple Cons Needs mechanism to select fast router Single point of failure Unbalanced loading of routers

15. Deterministic Fast RA Pros No inherent single point of failure One lost RA may not cause much of a slow down Cons Relatively complex negotiation Unbalanced loading but fairly simple to change that

16. Negotiation-free Deterministic Fast RA Pros Routers just need to listen to determine their delay for a given RS Cons RS needs to include some variable data like a TSLLAO –May be able to use source address if not :: and OptiDAD in use

17. Probabilistic Fast RA Pros Routers just need to listen to determine their delay –No negotiation No security required between routers Cons Some responses will be delayed (a small amount)