Re: IPv6 end user addressing

[Valdis.Kletnieks () vt edu]

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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