[143371] in North American Network Operators' Group
Re: IPv6 end user addressing
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Mon Aug 8 08:44:38 2011
To: Mohacsi Janos <mohacsi@niif.hu>
In-Reply-To: Your message of "Mon, 08 Aug 2011 10:15:17 +0200."
<alpine.BSF.2.00.1108081008390.92591@mignon.ki.iif.hu>
From: Valdis.Kletnieks@vt.edu
Date: Mon, 08 Aug 2011 08:43:32 -0400
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Mon, 08 Aug 2011 10:15:17 +0200, Mohacsi Janos said:
> - Home users - they usually don't know what is subnet. Setting up
> different subnets in their SOHO router can be difficult. Usually the
> simple 1 subnet for every device is enough for them. Separating some
> devices into a separate subnets is usually enough for the most
> sophisticated home users. If not then he can opt for business service....
You don't want to make the assumption that just because Joe Sixpack doesn't
know what a subnet is, that Joe Sixpack's CPE doesn't know either.
And remember that if it's 3 hops from one end of Joe Sixpack's internal net to
the other, you're gonna burn a few bits to support heirarchical routing so you
don't need a routing protocol. So if Joe's exterior-facing CPU gets handed a
/56 by the provider, and it hands each device it sees a /60 in case it's a
device that routes too, it can only support 14 devices. And if one of the
things that got handed a /60 is a wireless access point or something, it's only
going to be able to support 15 or so subnets. So a simple topology of only a
half dozen devices can burn up 8 bits of subnet addressing real fast. Yes, you
can conserve bits by being more clever, but then you probably need an IGP of
some sort....
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