Multiple Care-of Address Registration draft-ietf-monami6-multiplecoa-04.txt
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1 Multiple Care-of Address Registration draft-ietf-monami6-multiplecoa-04.txt Ryuji Wakikawa IETF 70th MEXT WG
2 Updates from -03 Change the handling of Status field. All the status value is defined for BA Alternate CoA option is omitted, but using C flag is recommended. Many editorial updates
3 Alternate CoA option For binding update protected by ESP, Alternate CoA option MUST be presented [RFC3776] BID option is used as a substitute of Alternate CoA option BID option carries the Care-of Address when C flag is set
4 Status Code Two status cods in binding acknowledgement status field in binding acknowledgement status field in BID option If the status value in BID set to zero, the receiver uses the status value in BA for all the bindings specified in BA. Otherwise, it uses the status value in BID examples [BA, status=0][bid, status=0] -> Accepted [BA, status=0][bid, status=128] -> Reason Unspecified
5 DSMIPv6 Support No support for IPv4 CoA BID option can be extended to carry IPv4 CoA instead of IPv4 CoA option
6 Bulk Registration for CN Bulk registration is only valid for home registration In order to support RO, we need certain extension to RR in order to carry multiple CoAs at once We had consensus not to support RO in the monami6 WG because of protocol simplicity
7 RR with Bulk Registration (slide used in IETF65) When multiple CoAs are in a Binding Update Authenticator cannot be calculated for all CoAs No authentication for all CoAs Two options forget bulk registration for CNs. Using separate binding update for CNs Extending BID option to carry authenticator. Keep the home/careof nonce index and authenticator in the BID option
8 Simultaneously Home and Foreign attachments (The slide used in IETF65) Three options when MN returns home keep IF attached to the home link deregistering binding (HA stop proxy ND) keep IF attached to the foreign link disable the interface attached to home (HA keep proxy ND) keep both IFs how?? The problem when MN uses both HA cannot intercept packets when MN returns home because it stop proxy ND If HA keep proxy ND, DAD will be occurred
9 H flag for BID sub-option (Slide used in IETF69) MN utilize interfaces attached to home and foreign links simultaneously with H flag set in BID sub-option Home Binding (H) flag indicates that the mobile node is attached to the home link. This flag is valid for Home Registration, Deregistration and bulk registration. Internet Assumption when H flag is used, HA MUST NOT use Proxy ND to intercept packets for MN on the home link. draft-wakikawa-mip6-no-ndp-01.txt HA 2001::1 (HA) 3ffe::1 (CoA) Binding 2001::2-2001::2 BID-1(H) 3ffe::1 BID-2 MN 2001::2 (HoA)
10 Comments from Keigo (Slide used in IETF67) When MN returns home, it creates CoA from its home prefix (Home-CoA) and registers it to HA Advantage MN can utilize an interface attached to the home link and other interfaces attached to foreign links Issues The definition of HoA and CoA (RFC3775) is modified. MN starts NS for the destination located on the home link (bypass tunnel?) Priority of NDP/Routing Table/Binding Cache?? I m afraid of side-effect of this changes. (ex. IKE?, MR routing update, etc) HA IP-in-IP tunnel HA IP-in-IP tunnel Binding 2001::2-2001::3 2001::1 (HA) MN 2001::1 (HA) MR 2001::3 (home-coa) 2001::2 (HoA) Binding 2001::2-2001::3 - MNP MNP 2001::3 (home-coa) 2001::2 (HoA)
11 Operational Solution for returning home (Slide used in IETF67) If a home link is multihomed (i.e. advertising one home prefix and another foreign prefix), similar configuration can be achieved HA IP-in-IP tunnel Binding 2001::2-2002::3 2001::1 (HA) MN 2002::3 (CoA) 2001::2 (HoA) HA 2001::1 (HA) No returning home RA (2001::/64 and 2002::/64) HA 2001::1 (HA) MN 2001::2 (HoA) MN Returning Home 2001::2 (HoA)
12 Comments from Vijay MN does not defend its HoA at the home link if HA still keeps bindings Let HA intercept all the packet first and tunnel/forward to MN by one of registered bindings For sending and receiving packets at the interface attached to home link HA learns the L2 address of the interface MN learns the L2 address of the HA Using learned L2 address to construct packets
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