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Re: Extending a /64

Brian E Carpenter <brian.e.carpenter@gmail.com> Sun, 15 November 2020 21:15 UTC

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Subject: Re: Extending a /64
To: Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com>, ipv6@ietf.org
References: <202011151920.0AFJKN9U003337@mail2.mwassocs.co.uk> <3d26bffe-b6c9-4ed7-6135-a515f9902fd7@gmail.com> <m1keOTi-0000EGC@stereo.hq.phicoh.net>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Message-ID: <f740941f-8d5b-ca9f-653b-456d0230e5ef@gmail.com>
Date: Mon, 16 Nov 2020 10:15:23 +1300
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On 16-Nov-20 09:18, Philip Homburg wrote:
>> Again, there are 35 trillion /48s in 2000::/3. How many would you
>> need?
> 
> It gets tight when you want the prefix to contain 39 bits to number around
> half a million planes.

I don't understand that statement at all. Why would such a constraint exist?
If there is such a constraint, that sounds like a design error of some kind.
(2^39-1 is 536,870,911, so there's some leeway anyway.)

   Brian

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