[146936] in North American Network Operators' Group
Re: IPv6 prefixes longer then /64: are they possible in DOCSIS
daemon@ATHENA.MIT.EDU (Owen DeLong)
Mon Nov 28 16:46:32 2011
From: Owen DeLong <owen@delong.com>
In-Reply-To: <CAP5kh1De2HMh1bdEF8-OvbD22nLHwPazPKKeyYqP_DsroZ=iBA@mail.gmail.com>
Date: Mon, 28 Nov 2011 13:43:37 -0800
To: Dmitry Cherkasov <doctorchd@gmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
You can probably do it, but, what do you gain by doing so?
Owen
On Nov 28, 2011, at 3:37 AM, Dmitry Cherkasov wrote:
> Hello everybody,
>
> It is commonly agreed that /64 is maximal length for LANs because if
> we use longer prefix we introduce conflict with stateless address
> autoconfiguration (SLAAC) based on EUI-64 spec. But SLAAC is not used
> in DOCSIS networks. So there seems to be no objections to use smaller
> networks per cable interfaces of CMTS. I was not able to find any
> recommendations anywhere including Cable Labs specs for using
> prefixes not greater then /64 in DOCSIS networks. Some tech from ISP
> assumed that DHCPv6 server may generate interface ID part of IPv6
> address similarly to EUI-64 so MAC address of the device can easily be
> obtained from its IPv6 address, but this does not seem like convincing
> argument. What do you think?
>
>
> Dmitry Cherkasov
