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 19:21 UTC

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Date: Wed, 23 Oct 2013 12:20:56 -0700 (PDT)
From: Mark ZZZ Smith <markzzzsmith@yahoo.com.au>
To: Nick Hilliard <nick@inex.ie>, "Ole Troan \(otroan\)" <otroan@cisco.com>
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Cc: "v6ops@ietf.org" <v6ops@ietf.org>, "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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----- Original Message -----
> From: Nick Hilliard <nick@inex.ie>
> To: Ole Troan (otroan) <otroan@cisco.com>om>; Mark ZZZ Smith <markzzzsmith@yahoo.com.au>
> Cc: "v6ops@ietf.org" <v6ops@ietf.org>rg>; "draft-liu-bonica-v6ops-dhcpv6-slaac-problem@tools.ietf.org" <draft-liu-bonica-v6ops-dhcpv6-slaac-problem@tools.ietf.org>
> Sent: Wednesday, 23 October 2013 9:06 PM
> Subject: Re: [v6ops] DHCPv6/SLAAC Make Hosts Confusing-//RE: new draft: draft-liu-bonica-v6ops-dhcpv6-slaac-problem
> 
> On 23/10/2013 17:21, Ole Troan (otroan) wrote:
>>  DHCP gives out addresses, not prefixes that can be used for onlink 
> determination. 
> 
> 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
> 

RAs are prehaps misnamed. They're not really router advertisements, they're advertisements (typically) sent from routers. View them as layer 3 configuration protocol packets, because they do far more than advertise a default router, and don't even need to advertise a default router to be useful.

They can be use for:

- changing host MTUs, instead of individual manual configuration on each host
- announce on-link presence of prefixes, exclusive of whether hosts have addresses within the prefix, instead of individual manual configuration on each host
- adjust neighbor discovery parameters (e.g., timers), instead of individual manual configuration on each host
- announce prefix(es) to be used to generate SLAAC addresses, instead of individual manual configuration on each host
- indicate to hosts whether to use DHCPv6 or SLAAC or both (during a transition between SLAAC/DHCPv6 or vice-versa), instead of individual manual configuration on each host
- advertise a default router, and an associated lifetime, instead of individual manual configuration on each host




> networks.
> 
> Nick
>