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Re: comments on draft-larsson-v6ops-mip-scenarios-00.txt



On Fri, 19 Nov 2004, Henrik Levkowetz wrote:
on 2004-11-19 9:03 pm Pekka Savola said the following:
=> And? Actually, HMIPv6 has this feature already. So it's not
entirely new to MIPv6.

This doesn't help because it seems to be kind of using stateless address autoconfiguration mechanisms, so it's entirely dependant on v6. You cannot deploy similar technology for v4.

With v4, at least (and possibly with v6, depending on the solution),
the home agent will have to keep some DHCP-like "address pool".
Putting that code in the MIPv6 HA function is a non-trivial exercise.

Actually, MIP4 simply defines the protocol for delivering the dynamic address to the mobile node. Whether it is handled by the HA through an address poll, through interaction with a DHCP server etc, isn't defined.

People have implemented several different solutions, which all work;
this is good, and I don't see why we in discussing a draft laying out
the playing field have to go into details which hasn't even been
specified by the base protocol (in the MIP4 case) ??

Because adding v4 address assignment to MIPv6 is a relatively weighty operation; whether the code or even specification already exists for _MIPv4_ seems irrelevant. MIPv6 just hasn't been designed with address assignment, and stateful address assignment by the HA in particular, in mind. If a particular solution would force one to specify and implement something like that on MIPv6 HAs, some people might get excited.


The same applies, possibly to a lesser degree, with MIPv4. 'Lesser degree' because IPv6 assignment can be stateful while IPv4 assignment cannot. 'Possibly' depending if some spec already existed how exactly to do it; Hesham seems to be saying yes, you seem to be saying no. I guess this means implementation(s) exist but the spec does not.

--
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings