ISP DHCPv6 and /48

Fri Jul 10 16:29:17 UTC 2015

My solution would be to tell them if they want more than 1 IPv4 /32, they need a router.
Then route a prefix of appropriate size to their router.

/48 for IPv6 as you are doing, and /n for IPv4.

They want 2 addresses, give them a /30. 3-6, /29; 7-14, /28, etc.

Seems pretty straight forward to me.

Owen

> On Jul 10, 2015, at 02:26 , Baldur Norddahl <baldur.norddahl at gmail.com> wrote:
> 
> 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?
> 
> 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