Good ${greeting_time}, Michiel!

10 Jan 2022 16:06:26, you wrote to Bj”rn Felten:

 MvdV>>> Just one /64 would not be satisfactory to me.
 BF>> Doesn't a /64 contain 2^64 addresses? Not enough? The entire IPv4
 BF>> pool is 2^32...
 MvdV> It is not that 2^64 addresses are not enough for all my devices,
 MvdV> it is that a /64 can not be divided into subnets.

[Top-secret, burn before reading!]
It can.

And on my early experiments, when the /64 was the only block I had, that was really great.

 MvdV> That is the way it is designed. A /64 is the smallest subnet.

No. The /64 is the default subnet size, and people normally SHOULD NOT (as in FTA-1006) split these blocks further, but that IS possible and NOT prohibited.

 MvdV> I might have designed it different but I was not involved at
 MvdV> the time.

IPv6 is not that strict as, for example, IPX was.

 MvdV> So... if one wants/needs more than one subnet, one needs more than
 MvdV> one /64. That is the way it is. It should be no problem, there is
 MvdV> enough for everyone.

Here in Russia the de-facto standard is one MAC-based IPv6 address for the outer-side link and /64 subnet routed via that address to the customer's LAN. Additional subnets may be requested as well, but ISP admins say most people don't request them.


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Alexey V. Vissarionov aka Gremlin from Kremlin
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