[111346] in North American Network Operators' Group
v6 & DSL / Cable modems [was: Private use of non-RFC1918 IP space
daemon@ATHENA.MIT.EDU (Patrick W. Gilmore)
Wed Feb 4 19:16:42 2009
From: "Patrick W. Gilmore" <patrick@ianai.net>
To: NANOG list <nanog@nanog.org>
In-Reply-To: <498A2DED.5040601@rollernet.us>
Date: Wed, 4 Feb 2009 19:16:36 -0500
Errors-To: nanog-bounces@nanog.org
On Feb 4, 2009, at 7:08 PM, Seth Mattinen wrote:
> Patrick W. Gilmore wrote:
>>
>> Second, where did you get 4 users per /64? Are you planning to hand
>> each cable modem a /64?
>
>
> That was the generally accepted subnet practice last time I had a
> discussion about it on the ipv6-ops list. I'm not an ISP, but I have a
> /48 and each subnet is a /64. Some devices will refuse to work if you
> subnet smaller than a /64. (Yes, poorly designed, etc.)
I Am Not An ISP either. :)
I guess I was thinking about v4 modems which do not get a subnet, just
an IP address. If we really are handing out a /64 to each DSL & Cable
modem, then we may very well be recreating the same problem.
And before anyone says "there are 281474976710656 /48s!", just
remember your history. I was not there when v4 was spec'ed out, but I
bet when someone said "four-point-two BILLION addresses", someone else
said "no $@#%'ing way we will EVER use THAT many...."
--
TTFN,
patrick
