Re: [Mip4] RFC3344biz Dynamic HoA bug ?

On Wed, Mar 24 2004, at 21:03:26 -0500, O'Neill Alan wrote:
> A MN places 0.0.0.0 into the Home Address field of the RREQ to trigger
> assignment by the Home Agent. The address allocation lifetime is assumed to
> be the MIP binding lifetime because no other information exists, and
> permanent allocations are of course not good. However, what then happens when
> the MN returns home ?

This has been discussed before on this list and I think that this is
really a problem that we should solve before we have n proprietery
solutions. Good that you brought up the discussion again! There
have been at least two drafts that have been addressing this
problem. Without any further digging I found these:
- draft-glass-mobileip-agent-dhcp-proxy
- draft-thuel-mobileip-tt

> The MN cancels the binding, and according to the spec ceases to use MIP
> signaling. However, if the address lifetime is tied to the binding lifetime
> then the MN just lost its address. I assume this might not have been spotted
> before because we are mostly focusing on cellular systems where the MN has a
> virtual home network, and hence cannot ever get home, but given the scope of
> RFC3344 this 'hole', if people concur, needs to be filled. The following
> options spring to mind.

I have been focusing on non-cellular systems for a number of years and
come across this problem several times in real deployment scenarios. So
far this can only be solved with proprietery solutions and I really
support standardizing a solution. Something along the lines with your
proposed HALG/HALR sounds reasonable. I think this is the way to go.

  Bjorn

-- 
Bjorn Andersson <bjorn@iki.fi>
PGP id 5AFC144B

-- 
Mip4 mailing list: Mip4@ietf.org
    Web interface: https://www.ietf.org/mailman/listinfo/mip4
     Charter page: http://www.ietf.org/html.charters/mip4-charter.html
Supplemental site: http://www.mip4.org/