[182092] in North American Network Operators' Group
Re: ISP DHCPv6 and /48
daemon@ATHENA.MIT.EDU (Mark Andrews)
Fri Jul 10 06:09:13 2015
X-Original-To: nanog@nanog.org
To: Baldur Norddahl <baldur.norddahl@gmail.com>
From: Mark Andrews <marka@isc.org>
In-reply-to: Your message of "Fri, 10 Jul 2015 11:26:32 +0200."
<CAPkb-7C5LX0QwYpFq5QYyvFaHSbQfvW7tkHsuezvqDtMVYCY_w@mail.gmail.com>
Date: Fri, 10 Jul 2015 20:09:02 +1000
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
In message <CAPkb-7C5LX0QwYpFq5QYyvFaHSbQfvW7tkHsuezvqDtMVYCY_w@mail.gmail.com>
, Baldur Norddahl writes:
> Hello,
>
> Let me introduce another first world problem. We use DHCPv4 to assign each
> user a IPv4 /32 and DHCPv6-PD to assign a IPv6 /128 WAN plus a /48 prefix.
> All good.
>
> However we are an ISP where the customer chooses his own CPE. We just ship
> a modem/mediaconverter/ONU with one ethernet port. The customer is expected
> to plug his home router in here.
>
> However sometimes we have a customer that wants to buy an extra IPv4
> address. We are happy to sell him that. Now he has two (or more) IPv4
> addresses. Turns out most of these customers are not configuring the extra
> IPv4 addresses on a single home router (most CPEs probably can not handle
> multiple WAN addresses anyway). Instead these people put in a switch and
> then have multiple devices, each with one IPv4.
>
> A typical setup is a home router (CPE) plus a server, or they might have
> some VPN device forced on them by their employeers or they might simply be
> sharing the internet connection with the neighbour (we allow that).
>
> However we are forbidden to deliver more than one /48. What to do?
Who is forbidding you? Not the IETF. Not the RIRs.
> Currently we will deliver exactly one /48 to one device and just say sorry,
> you will have to figure out how to get IPv6 on your other devices. The
> experience is that 100% of the guys then simply do not have any IPv6 on the
> other devices. Figuring out how to route a slice of that /48 is too much
> for even most technical minded customers.
>
> Would you deliver say /52 prefixes instead but reserve /48, so the DHCP
> server has the option to deliver up to 16x /52 per customer?
>
> Regards,
>
> Baldur
Just have them deploy a IPv6 router and configure it to brigde IPv4.
As far as the existing clients are concerned they will just be on
a LAN with a /64 out of the /48 and IPv4.
A cheap linux / *bsd box will do this.
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka@isc.org
