[180743] in North American Network Operators' Group
Re: Android (lack of) support for DHCPv6
daemon@ATHENA.MIT.EDU (Mikael Abrahamsson)
Wed Jun 10 08:03:56 2015
X-Original-To: nanog@nanog.org
Date: Wed, 10 Jun 2015 14:03:47 +0200 (CEST)
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: Baldur Norddahl <baldur.norddahl@gmail.com>
In-Reply-To: <CAPkb-7AcXNu_rj_=4DaH3dFoLE2eARch=NaGK5dCFAi-DpWktw@mail.gmail.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
On Wed, 10 Jun 2015, Baldur Norddahl wrote:
> We use DHCPv6 to assign just one IP address to the CPE. This is because
> otherwise our routers do not know where to route the /48 that is also
> passed along with DHCPv6-PD.
If you use DHCPv6-PD you only need a LL address, you do not need a GUA
address. Yes, a GUA WAN address is nice for fault finding, shows up in
traceroute etc, but it's not needed. If your routers require a GUA WAN
address in order for DHCPv6-PD to work, then they're not standards
compliant.
> Apart from operational simplicity, we also do not want our routers to
> keep track of a million ND cache entries. Our system pushes that down to
> the CPE. In the network we only have one ND cache entry per customer.
Well, if you have a GUA /128, then you have two per customer (because
you'll have the LL one as well). If you didn't use the GUA address, you'd
only have one.
--
Mikael Abrahamsson email: swmike@swm.pp.se
