[180984] in North American Network Operators' Group
Re: Android (lack of) support for DHCPv6
daemon@ATHENA.MIT.EDU (Baldur Norddahl)
Sat Jun 13 06:30:34 2015
X-Original-To: nanog@nanog.org
In-Reply-To: <alpine.DEB.2.02.1506130910180.9487@uplift.swm.pp.se>
Date: Sat, 13 Jun 2015 12:30:29 +0200
From: Baldur Norddahl <baldur.norddahl@gmail.com>
To: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
On 13 June 2015 at 09:11, Mikael Abrahamsson <swmike@swm.pp.se> wrote:
> On Fri, 12 Jun 2015, Baldur Norddahl wrote:
>
> Can someone explain to me how Android uses SLAAC to implement tethering?
>>
>
> https://tools.ietf.org/html/rfc7278
>
> --
I have not read it in detail, but correct me if I am wrong, that stuff will
NOT work while the phone is on wifi.
Quote:
"
As [RFC6459 <https://tools.ietf.org/html/rfc6459>] describes, the
3GPP-network-assigned /64 is completely
dedicated to the UE and the gateway does not consume any of the /64
addresses. The gateway routes the entire /64 to the UE and does not
perform ND or Neighbor Unreachability Detection (NUD) [RFC4861
<https://tools.ietf.org/html/rfc4861>].
Communication between the UE and the gateway is only done using
link-local addresses and the link is point-to-point.
"
It is like a DHCP-PD of a /64 to the phone.
I fail to see what relevance that has to a phone supporting DHCP on a Wifi
or LAN link.
Except of course that it should make it trivial for Android to support
DHCP-PD. They already have a system that can consume a /64 from a prefix
delegation and use that for both applications on the phone and for
tethering (does tethering while on Wifi make sense? - it is possible using
bluetooth to a laptop).
Regards,
Baldur
