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Re: [v6ops] I-D Action: draft-ietf-v6ops-unique-ipv6-prefix-per-host-07.txt

Sander Steffann <sander@steffann.nl> Sun, 06 August 2017 18:24 UTC

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From: Sander Steffann <sander@steffann.nl>
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Date: Sun, 06 Aug 2017 20:24:34 +0200
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To: Simon Hobson <linux@thehobsons.co.uk>
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Subject: Re: [v6ops] I-D Action: draft-ietf-v6ops-unique-ipv6-prefix-per-host-07.txt
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Hi Simon,

> In reality, if the ISP hands out a /48 then there are 2^80 addresses there. Now we go and constrain that (by continued insistence on "there shalt be no other allocation than /64") such that there are now only 2^16 available prefixes - but that assumes the entire /48 is available for such allocation. As I pointed out, by the time you have allowed for multiple sites, multiple networks, you might only have 2^8 prefixes

Most (all?) RIRs allow a /48 per site. I haven't seen ISPs give one /48 to a customer and then divide it over the connections ("sites") that that customer has. It far more convenient for everybody to just give each connection/site a separate /48. And business-ISP really shouldn't give any customer any less.

Cheers,
Sander

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