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- Editor's note: These minutes have not been edited
-
-
- IP Routing for Wireless/Mobile Hosts (mobileip)
- Working Group Minutes
- 36th IETF, Montreal, Canada
- (reported by Steven M. Glass <glass@ftp.com>
- further edited by Jim Solomon <solomon@comm.mot.com>)
-
- ======================================================
- ================
-
- I) Mobile IPv6, Wednesday, June 26, 1996, 1300 - 1500
-
- 1) Agenda Bashing: no items added
-
- 2) Administravia:
- - All IPv4 docs (except route optimization) have been approved as
- Proposed Standard RFC's.
- - New co-chair Erik Nordmark <nordmark@eng.sun.com> of Sun
- Microsystems announced.
- - Routing Area Director Joel Halpern presented the requirements for
- advancing the IPv6 mobility draft to PS RFC:
- 1) Language of the doc must be acceptable to the working group.
- 2) Need an applicability statement.
- 3) Normally require implementation (and deployment) but the IESG
- is understanding of the limitations on currently using IPv6.
- Thus, this requirement will be waived.
-
- 3) Discussion on: draft-ietf-mobileip-ipv6-01.txt, Dave Johnson
- <dbj@cs.cmu.edu> and Charlie Perkins <charliep@watson.ibm.com>
-
- - Two implementations are under development (IBM & CMU).
-
- - Deregistration is tricky, and the order of events in deregistering
- with your home agent should be clearly stated as is done in the
- IPv4 draft.
-
- - After much rehashing of old arguments, it was once again decided
- that the home agent is indeed a "router" -- i.e. a device which
- "forwards packets not addressed to itself". An important
- observation is that only routers can receive IPv6 anycast packets,
- which has implications to "home agent discovery" by mobile nodes.
-
- - It was decided that Mobile IPv6 need not impose any new
- requirements upon the base IPv6 protocol documents. In summary, it
- was decided that IPv6 routers SHOULD (as distinctly opposed to
- MUST) implement home agent functionality; and, likewise, IPv6
- nodes
- SHOULD (as distinctly opposed to MUST) implement binding cache
- and
- insertion of routing headers for routing packets to mobile nodes.
- Some key observations about these decisions:
-
- + Not all routers have static/stable storage (as protection from
- hard resets) for storage of binding information for mobile nodes.
- A suggestion was made to add a "stable storage flag" to the
- neighbor advertisement (or the binding acknowledgement) so that a
- home agent could advertise this capability to prospective mobile
- nodes.
-
- + One implication of not requiring ALL routers to be home agents is
- that the "anycast" method of home agent-discovery as laid forth
- in the current draft is broken. This is because a non-home-agent-
- but-a-router-nonetheless could consume the anycast. It was
- agreed that a solution to the home agent discovery problem should
- be architected and included in the Mobile IPv6 draft.
-
- + The Binding Update destination option needs to be encoded in such
- a way so that nodes that don't understand it send ICMP errors
- back to the source. There should also be a return code in the
- Binding Acknowledge that says "I support this but I don't have
- any room for you in my cache."
-
- + If a host (that is not a router) supports a binding cache, it
- MUST use its current bindings in preference to it's routing table
- when sending a packet to a mobile node.
-
- - There was consensus that the Lifetime of a binding should work
- similarly to the IPv4 mobility mechanism; i.e. a mobile node
- proposes a Lifetime but the home agent MAY reduce the Lifetime to
- an amount of time that it is actually willing to provide service.
-
- 4) Discussion on draft-teraoka-ipv6-mobility-sub-03.txt, Fumio
- Teraoka <tera@csl.sony.co.jp>.
-
- [Although this discussion actually occured in the second meeting
- (due to lack of time in the first), it is included here because
- of its topic area; namely, IPv6 mobility.]
-
- - Several issues were raised regarding the working group draft. It
- is the chair's opinion that Fumio should work with the co-authors
- of the working group draft, within the framework set forth in that
- document, to address any substantive deficiencies that can be
- identified. Topics for discussion included sourcing of multicast
- packets by mobile nodes, firewall traversal, and appropriateness of
- the utilization of routing headers.
-
- ======================================================
- ================
-
- II) Mobile IPv4, Thursday, June 27, 1996, 1300 - 1500
-
- 1) Agenda Bashing: no items added
-
- 2) Administravia:
- - All IPv4 docs (except route optimization) have been approved as
- Proposed Standard RFC's.
- - New co-chair Erik Nordmark <nordmark@eng.sun.com> of Sun
- Microsystems announced.
- - To advance the documents further, requires "significant operational
- experience". (cf RFC 1264)
-
- 3) Presentations.
-
- A number of presentations were given, each of which has slides that
- will go into the IETF proceedings. Several of them focussed on
- firewall travesal by mobile nodes, which is seen as a key topic area
- to be addressed by the working group in order to provide more broad
- applicability of Mobile IP.
-
- Other presentations focussed on fast converging handoff algorithms
- and link quality extensions to the Mobile IPv4 registration
- protocol.
-
- Finally, route optimization was discussed in which Dave Johnson
- summarized the changes to be made in the draft. These basically
- boil down to making route optimization work in IPv4 mobility in a
- similar fashion to that proposed for IPv6 mobility.
-
-