> I came up with the answer to your question. It takes some work, but it's
> there. Review draft-ietf-mobileip-ipv6-12.txt
>
> One the router advertisements (sections 4.1, 5.6, 5.7, etc), the routers
> tell you whether they are willing to be a home agent and/or a foreign
> agent. If no neighboring system is willing to be your home agent but there
>
> is a foreign agent, you are roaming. If there is someone willing to be a
> home agent but you cannot authenticate with him, your previous home agent
> remains your home agent, and you are roaming. If someone advertises that
> he
> will be your home agent and you can authenticate with him, you are at
> home.
>
=> I'm not sure if I understand what you mean by the foreign agent.
Perhaps you have another entity in mind ? Because the current MIPv6
draft does not have foreign agents.
> The one thing that bothered me as I read this was an implicit assumption,
> perhaps on my part and perhaps on the author's part, that the device has
> to
> somehow come in contact with its home agent as a neighboring device once
> in
> a while. I can think of a number of scenarios in which this may not be
> true
> - imagine a case where you have a telephone mailed to you on the road
> because the old one broke. You certainly want to be able to tell the new
> phone the old phone's information and have it stick. Or imagine a device
> which is permanently roaming - it never actually is at home. You would
> want
> to configure a home agent address somehow. I trust that in these cases the
>
> protocol is not required.
>
=> You never need to configure a Home Agent address. The
current draft specifies a Dynamic Home Agent Discovery mechanism.
All you need to configure is a Home Address.
I believe MIPv6 can support the scenario you mentioned provided
the MN knows its Home Address. Which is a reasonable assumption
IMO.
--------------------------------------------------------------------
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 PROTECTED]
--------------------------------------------------------------------
