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IPv6 prefix lengths - how long?

"Templin (US), Fred L" <Fred.L.Templin@boeing.com> Fri, 07 June 2019 17:43 UTC

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From: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>
To: 6man WG <ipv6@ietf.org>
Subject: IPv6 prefix lengths - how long?
Thread-Topic: IPv6 prefix lengths - how long?
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Date: Fri, 07 Jun 2019 17:43:12 +0000
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Hi, we all know about the tussle regarding the /64 boundary for IPv6 prefixes but

assuming that we will one day want to allow longer prefixes the question is "how long"?



We all know about /127 for point to point links, but I am not talking about those. I am

talking about prefixes that are assigned to nodes that might be acting either as routers

or as multi-addressed hosts.



Because of RFC7934, we see the value of Host Address Availability Recommendations.

It makes the point that, due to the nature of multi-addressing supported by IPv6, it

would be useful for each node to be able to configure multiple (perhaps even many)

IPv6 addresses from an IPv6 prefix. But, "how many"?



My assertion is that a multi-addressed host (or, an End User Network router) should

support numbering for at least 1K IPv6 addresses. This would imply that (assuming

at some point the /64 boundary is relaxed) the longest IPv6 prefix should be a /118.



Thoughts?



Fred

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