Subject: Re: [MOBILE-IP] Doubts from <draft-elmalki-soliman-hmipv4v6-00.tx t>

From: "Karim El-Malki (ERA)" <[email-masked]>
Date: Tue, 8 Aug 2000 14:33:30 +0200

Hello Karann

The MIPv4 and MIPv6 parts from the draft you are referring to
have been made into separate drafts:

draft-elmalki-mobileip-fast-handoffs-02
draft-soliman-mobileip-hmipv6-00

>  Section 3, paragraph 3:
>  "If the packets for the MN are tunnelled from the HA, then
>  the GFA should
>  change the source and destination IP address of the
>  encapsulating header to the "next" FA towards the MN."
>
>  Do the authors mean changing source address to GFA's address, whereas
>  destination address is changed to the address of the next FA
>  towards the
>  MN?

Yes, thanks for pointing out the bad wording.

>
>  Another question (which is not the main issue in this draft):
>
>  Section 2, Paragraph 1 and 2 read:
>  "a MN may be attached directly to any FA within the hierarchy and may
>  move between FAs from different levels in the hierarchy. The
>  following
>  figure describes the Hierarchical MIPv4 network.
>                            ________
>                           |        |
>                           |  GFA   |
>                           |________|
>                            /   |  \
>                          ...  ...  ...
>                            ____|___
>                           |        |
>                           |   FA3  |
>                           |________|
>                      ______/_     _\______
>                     |        |   |        |
>                     |   FA2  |   |   FA1  |
>                     |________|   |________|
>                      ____|___     ____|___
>                     |        |   |        |
>                     |AP/RAN 2|   |AP/RAN 1|
>                     |________|   |________|
>                          |        ____|___
>                                  |        |
>                         CN       |   MN   |
>                                  |________|
>
>        Figure 1: Multi-level Hierarchical MIPv4 domain.
>
>  In the above figure, Access Points (APs) or Radio Access Networks
>  (RANs) consisting of multiple access points, are used to
>  provide a MN with
>  L2 access."
>
>  Am I right to say that: when one states that a MN may be
>  attached to and
>  moved freely among FAs at different levels of the hierarchy (such
>  statement appears not only in this draft, but others such as
>  HAWAII), it
>  is assumed that all of the FAs are connected to some kind of Access
>  Points or RAN?  So, the FA1, FA2, FA3 in figure above should
>  be connected
>  to some radio access points/network?
>
>  If so, how's the network practically look like?  Any example?  What
>  about: Each FA is connecting to a WaveLan ??  How about the
>  appliciable of
>  these  hierarchical architecture in a cellular network??

The figure above was modified in draft-elmalki-mobileip-fast-handoffs-02
and should reflect this more clearly. Comments welcome.

Regards,
Karim