[172548] in North American Network Operators' Group
Re: Ars Technica on IPv4 exhaustion
daemon@ATHENA.MIT.EDU (Laszlo Hanyecz)
Sun Jun 22 23:41:47 2014
X-Original-To: nanog@nanog.org
From: Laszlo Hanyecz <laszlo@heliacal.net>
In-Reply-To: <53A79FD8.1010301@hpl.hp.com>
Date: Mon, 23 Jun 2014 03:41:34 +0000
To: "Kalnozols, Andris" <andris@hpl.hp.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
On Jun 23, 2014, at 3:32 AM, "Kalnozols, Andris" <andris@hpl.hp.com> =
wrote:
>=20
> On 6/22/2014 7:41 PM, Frank Bulk wrote:
>> Did they ever explain why? Did the SMC function as a router, and act =
as the
>> customer side of a stub network that allowed that /29 to hang off the
>> router? If that was the case, and the Motorola D3 modem was L2-only, =
that
>> might explain the change in capability.=20
>=20
The Comcast business SMC gateway speaks RIP to make the routed /29 =
work.. in theory it could be put into bridge mode and you can do the RIP =
yourself but they don't support that configuration (you'd need the key =
to configure it successfully and they didn't want to do when I asked). =
If you poke around in the web UI, it does support IPv6 in some form, but =
it doesn't seem to be active for me.
If you don't have a static IP block from them and thus don't have the =
need to use RIP you can just use a regular DOCSIS 3 cable modem and get =
IPv6, but you only get one IPv4 number that way.
-Laszlo
> They didn't really go into detail. Your theory sounds correct; the
> four ports on the SMC router default to 10.1.10.0/24 but will also
> handle a routable /29 address from the WAN side of another router
> plugged into it.
>=20
> Since Comcast now charges $19.95 instead of $9.95/month for a /29,
> I inquired about the cost of an IPv6 assignment; same price as I
> recall being told. I then asked if that was for a /60 or /56 and
> he said no, eight IPv6 addresses (/125?). I politely thanked him
> and ended the phone call. I realize that I could have gotten a
> more realistic answer from another Comcast rep with more v6-fu
> but I didn't pursue it.
>=20
> Andris
>=20
>=20
>=20
>> -----Original Message-----
>> From: NANOG [mailto:nanog-bounces@nanog.org] On Behalf Of Kalnozols, =
Andris
>> Sent: Sunday, June 22, 2014 9:29 PM
>> To: nanog@nanog.org
>> Subject: Re: Ars Technica on IPv4 exhaustion
>>=20
>> <snip>
>>=20
>> My experience as a Comcast Business customer with a /29 IPv4 subnet =
was
>> that swapping out the SMC modem/router for an IPV6-capable Motorola
>> DOCSIS 3 modem meant that I could no longer have the /29.
>>=20
>> Andris
>>=20
>>=20
>>=20
