Lee Howard Lee at
Fri Dec 18 21:18:51 UTC 2015

On 12/17/15, 2:27 PM, "NANOG on behalf of Chuck Church"
<nanog-bounces at on behalf of chuckchurch at> wrote:

>-----Original Message-----
>From: NANOG [mailto:nanog-bounces at] On Behalf Of Matthew Petach
>Sent: Thursday, December 17, 2015 1:59 PM
>Cc: North American Network Operators' Group <nanog at>
>Subject: Re: Nat
>>I'm still waiting for the IETF to come around to allowing feature parity
>>between IPv4 and IPv6 when it comes to DHCP.
>And that recent thread on prefix delegation doesn't really leave a good
>taste in one's mouth about how to delegate a /56 or a /48 to a CPE, and
>get that/those prefix(s) in your (ISP) routing tables.  Given that
>99.999% of home users would be fine with a delegation of a single /64 and
>a single subnet I'm tempted to do that for now and let the DHCP-PD ink
>dry for a while so CPE support can follow up.

Which thread on which list?  DHCP-PD works to any home gateway that
supports IPv6. I know how the routing is set up in cable, don¹t know about
other access.
Or did you mean a prefix for a mobile device? Ongoing discussion in IETF
v6ops, with consensus that multiple addresses are needed.

There¹s disagreement among ISPs about what size prefix to delegate. So
what? Pick a number and do it. I don¹t know of anybody who thinks a /64 is
right for the home user, but I know of clueful people running every nibble
between /60 and /48. Pick a number, plan so you can change it later, and



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