Dynamic IP address assignment

[thomas chen]

i think you are refering to RFC3203

however... many DHCP out there have not implemented this...

basically this is a mechanism for DHCP daemon to issue a FORCE command
to ask client to re-get the IP assignment, DNS etc

tom at ceisystems.com wrote:
> 
> Jouni,
> 
>         That's exactly what I was thinking of.  The only reason I didn't
> go out looking on the IETF page myself is that I've been typing email
> replies since I sent my last one to this list.  I hate missing two full
> days of mail.
> 
>         Anyway, I agree.  Since there is no standard, and the draft is
> specific to say that an IP Addressing service would normally be handled
> by Layer 3 devices (IP, etc.), it really goes well beyond the scope of
> HostAP.
> 
>         That said, I'm sure someone could easily hack something up with
> one of my many existing DHCP servers.  I would think something on the
> order of registering a MAC address with the DHCP server, which would
> then determine what IP to assign to the client once it made its request.
> This is, of course, if it hasn't already been done.
> 
> Good luck,
> Thomas Cameron
> 
> > There is no such spec.. ;-) and even if there were, both
> > 802.1X and 802.11 are below IP layer and don't really care
> > about IP address assignment. IEEE 802.11i describes some IEEE
> > 802.1X <-> 802.11 interaction, but it does not consider
> > things like IP addresses for STAs.
> >
> > IETF draft draft-congdon-radius-8021x-30.txt might come
> > closest here with following description:
> >
> > 3.7.  Framed-IP-Address, Framed-IP-Netmask
> >
> > IEEE 802.1X does not provide a mechanism for IP address
> > assignment. Therefore the Framed-IP-Address and
> > Framed-IP-Netmask attributes can only be used by IEEE 802.1X
> > Authenticators that support IP address assignment mechanisms.
> >  Typically this capability is supported by layer 3 devices.
> >
> >
> >
> > But like I said before, this could be something like calling
> > a separate program, etc. In other words, implementation specific.
> >
> > --
> > Jouni Malinen                                            PGP
> > id EFC895FA
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