[167535] in North American Network Operators' Group
Re: IPv6 /48 advertisements
daemon@ATHENA.MIT.EDU (Laszlo Hanyecz)
Wed Dec 18 11:36:54 2013
From: Laszlo Hanyecz <laszlo@heliacal.net>
In-Reply-To: <1A5C3257AD8D4946A4B497A6FAF501743C45E5B476@EXCH07-01.apollogrp.edu>
Date: Wed, 18 Dec 2013 16:36:39 +0000
To: Cliff Bowles <cliff.bowles@apollogrp.edu>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
It's standard to filter out anything longer than /48.
Your /36 prefix was chosen based on the number of sites, with a /48 per =
site, so just keep it simple. Trying to manage it in the way IPv4 =
addresses were managed will just ensure that you will have the same =
headaches of micro managing sub allocations and trying to guess the =
right sizes. The address space in V6 is large enough that you don't =
have to spend your time worrying about this, and that's one of the =
reasons for using a /48 at each site.
Think of an IPv6 /48 like you would think of an IPv4 /24 - except that =
it's the right size for either your house or your university campus.
Laszlo
On Dec 18, 2013, at 4:11 PM, Cliff Bowles <cliff.bowles@apollogrp.edu> =
wrote:
> I accidentally sent this to nanog-request yesterday. I could use some =
feedback from anyone that can help, please.
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> Question: will carriers accept IPv6 advertisements smaller than /48?
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> Our org was approved a /36 based on number of locations. The bulk of =
those IPs will be in the data centers. As we were chopping up the =
address space, it was determined that the remote campus locations would =
be fine with a /60 per site. (16 networks of /64). There are usually =
less than 50 people at the majority of these locations and only about 10 =
different functional VLANs (Voice, Data, Local Services, Wireless, Guest =
Wireless, etc...).
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> Now, there has been talk about putting an internet link in every =
campus rather than back hauling it all to the data centers via MPLS. =
However, if we do this, then would we need a /48 per campus? That is =
massively wasteful, at 65,536 networks per location. Is the /48 =
requirement set in stone? Will any carriers consider longer prefixes?
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> I know some people are always saying that the old mentality of =
conserving space needs to go away, but I was bitten by that IPv4 issue =
back in the day and have done a few VLSM network overhauls. I'd rather =
not massively allocate unless it's a requirement.
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> Thanks in advance.
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> CWB
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> ________________________________
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error, please notify the sender and remove it from your system.
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