Re: [v6ops] DHCPv6/SLAAC Make Hosts Confusing-//RE: new draft: draft-liu-bonica-v6ops-dhcpv6-slaac-problem

Mark ZZZ Smith <markzzzsmith@yahoo.com.au> Wed, 23 October 2013 20:01 UTC

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Date: Wed, 23 Oct 2013 13:01:06 -0700 (PDT)
From: Mark ZZZ Smith <markzzzsmith@yahoo.com.au>
To: Lorenzo Colitti <lorenzo@google.com>, "sthaug@nethelp.no" <sthaug@nethelp.no>
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Cc: "v6ops@ietf.org WG" <v6ops@ietf.org>, "Ole Troan \(otroan\)" <otroan@cisco.com>, "draft-liu-bonica-v6ops-dhcpv6-slaac-problem@tools.ietf.org" <draft-liu-bonica-v6ops-dhcpv6-slaac-problem@tools.ietf.org>
Subject: Re: [v6ops] DHCPv6/SLAAC Make Hosts Confusing-//RE: new draft: draft-liu-bonica-v6ops-dhcpv6-slaac-problem
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>________________________________
> From: Lorenzo Colitti <lorenzo@google.com>
>To: sthaug@nethelp.no 
>Cc: "v6ops@ietf.org WG" <v6ops@ietf.org>rg>; Ole Troan (otroan) <otroan@cisco.com>om>; draft-liu-bonica-v6ops-dhcpv6-slaac-problem@tools.ietf.org 
>Sent: Thursday, 24 October 2013 5:21 AM
>Subject: Re: [v6ops] DHCPv6/SLAAC Make Hosts Confusing-//RE: new draft:    draft-liu-bonica-v6ops-dhcpv6-slaac-problem
> 
>
>
>On Wed, Oct 23, 2013 at 7:20 PM, <sthaug@nethelp.no> wrote:
>
>> and if dhcpv6 gave out netmasks and default gateways, we could finally
>>> ditch RA.  I look forward to the day when I can finally expunge RA from my
>>> networks.
>>
>>Amen. But it doesn't look like this is going to happen any time soon...
>>
>
>
>And then what? Rely on client polling to before you can change any network parameter, ever? Be forced to run things like VRRP because you can never change anything on the hosts?
>
>
>Sure that's the way we do it today in IPv4. But is it the best way? Maybe in an enterprise, but in a home?

Having learned about Novell's IPX before I learnt IPv4, I've since had a bit of an interest in the different ways different protocols do things, with addressing being one of the more interesting areas. Of all the protocols I've since looked at or learned over the years (which I think would count to be around or at least 1/2 a dozen), only IPv4 with DHCPv4 has used a centralised, database and quite stateful address allocation and configuration method. As DHCPv4 was developed quite a number of years after IPv4 addressing had originally been defined and then evolved through the addition of classes and subnets, it would seem that the model used by DHCPv4 is likely to have been chosen to solve needs or a situation that doesn't normally exist when developing a protocol from scratch. If you go back far enough with IPv4, similar to Novell IPX and Xerox XNS, it also used the link-layer addresses as host addresses:

https://www.rfc-editor.org/ien/ien91.txt


So in the history of protocol development and addressing, the DHCPv4 model is quite an anomaly.


> What happens when your precious "DHCPv6 server" (home router) gets unplugged by the user and all the hosts are dead in the water until they decide to send another DHCPv6 request, even though there are 3 other routers and DHCPv6 servers on the same link?
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