Re: [Mip4] WG Last call on draft-ietf-mip4-dynamic-assignment-00.txt(SECOND REQUEST)

[Hans Sjöstrand <hans at ipunplugged.com>]

Sorry for being late with my comment,

I think the proposal is a good proposal. And so does a few of my 
customers who has asked for the functionality. To bad that they didn't 
flag their interest on the list.

However, there is one thing that I think is needed to be added to the 
draft to make the function usable. The extension carries to little 
information.

Normally a router or gateway with HA functionality have several 
interfaces. The natural setup is that the gateway is accessible to 
internet on one interface (or address) and have the HA advertising the 
home network on another network. In many cases the home network have a 
private address space.

The MN needs to know two things,
1) The address which I can reach my home agent from internet (the 
"external address").,
2) The address which my home agent is advertising on the home network 
(the "internal address").

In the case with dynamic home agent assignment, the MN is informed about 
the assigned "external address", but he is totally unaware of the 
"internal address". Subsequently the MN will never be able to recognise 
when he has entered his home network. Therefore this information needs 
to be relayed to him. Preferably in the Redirected HA address extension 
which then would look something like

  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |     Type      |    Length     |               Reserved        |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                   Home Agent External Address                 |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                   Home Agent Internal Address                 |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 Home Agent External Address The IP address that the home agent is 
externally
                             reachable. This might be a IP address on 
the Home
                             agent or a IP address of an external 
device that
                             will redirect or map the IP packets to the 
home agent.

 Home Agent Internal Address The IP address of the home agent. This 
might be the
                             same address as the Home Agent External 
Address or an
                             address on an internal network. This 
address MUST be
                             the same address that the Home agent uses 
for the
                             Mobility Agent Advertisements.


Best regards
/// Hasse

Henrik Levkowetz wrote:

> SECOND REQUEST - To date, no response to this WG last call has been
> received.  If enough responses are not received to support the
> acceptance of this document, it *will not* be submitted to the IESG for
> publication.  Please respond to this WG last call.  If you support
> acceptance of the document without change, respond with a simple
> acknowledgment, so that support for the document can be assessed.
>
> --------
>
> This message announces a WG last call on "Mobile IPv4 Dynamic Home Agent
> Assignment" <draft-ietf-mip4-dynamic-assignment-00.txt>.  The last call
> will conclude at 24:00 UTC on Friday, 13th Feb 2004.
>
> Please respond to this WG last call.  If you support acceptance of the
> document without change, respond with a simple acknowledgment, so that
> support for the document can be assessed.
>
> draft-ietf-mip4-dynamic-assignment-00.txt proposes a messaging mechanism
> for dynamic home agent assignment and HA redirection. The goal is to
> provide a mechanism to assign an optimal HA for a Mobile IP session
> while allowing any suitable method for HA selection.  
> This draft is available as
> <http://www.ietf.org/internet-drafts/draft-ietf-mip4-dynamic-assignment-00.txt>
>
> 	Regards,
> 		Henrik
>  

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