Subject: RE: [Monet] The semantics of the Routing Header?

From: Jung Cyndi-ACJ099 <[email-masked]>
Date: Mon, 4 Feb 2002 20:31:40 -0600

Pekka,

In IPv6, the mobile node builds a Care-of-Address from
Router Advertisements received on the visited network and
uses it as a temporary, topologically correct, IPv6 address.
When he moves, he gets another Care-of-Address - he always
keep the Home Address, and all other nodes that communicate
with him use the Home Address to identify him, except when they
are capable of Route Optimization.  It is in Route Optimization
that the communicating node uses the Routing Header to build what
looks identical to a Source Route option, with the Care-of-Address
being the first entry in the source route, and the Home Address
being the second - and final - entry of the source route.  It is
a special case of Source Route, since both addresses in the list
are "being used" by the same node.  Perhaps it should have been a
separate option for all the confusion that it is apparently
generating, but when it was conceived it must have seemed like
a good thing - a way to conserve IPv6 option code points perhaps?

Cyndi

>The reason why I am asking this is the scenario, which
>Charlie Perkins has offered, where a packet is source
>routed through a Mobile Node that is away from home.
>According to his argumentation, in such case the
>routing header should have a route looking like
>
>    .... - Care-of-Address - Home Address - ....
>
>where the Care-of-Address is the current location of
>the mobile node, and the Home Address is more like
>the end-point identifier of the mobile node.  I am
>having hard time in clearly crasping the intended
>semantic meaning of this construction.
>
>--Pekka Nikander

_______________________________________________
Monet mailing list
[email-masked]
--------------------------------------------------------------------
IETF IPng Working Group Mailing List
IPng Home Page:                      http://playground.sun.com/ipng
FTP archive:                      ftp://playground.sun.com/pub/ipng
Direct all administrative requests to [email-masked]
--------------------------------------------------------------------