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Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)

"Templin (US), Fred L" <Fred.L.Templin@boeing.com> Thu, 18 February 2021 21:57 UTC

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From: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>
To: Ted Lemon <mellon@fugue.com>
CC: Fernando Gont <fgont@si6networks.com>, IPv6 Operations <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>
Thread-Topic: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)
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Date: Thu, 18 Feb 2021 21:57:42 +0000
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Subject: Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)
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Ted, that is fine but I think there is a new scope to be considered – call it “MANET-local”
scope. I think HITs would be useful for MANET-local scope communications, but a real
GUA would be needed for global-scope communications should the MANET ever
connect to the global Internet (and GUAs can be gotten with good old DHCPv6 PD).

Yes, ULAs could also be used for MANET-local scope communications instead of HITs.
But, as Brian observed, HITs are like ULAs on steroids and they are generated based
on a cryptographic hash of the node’s public key – which seems like it ought to be
good for something.

Fred

From: Ted Lemon [mailto:mellon@fugue.com]
Sent: Thursday, February 18, 2021 1:06 PM
To: Templin (US), Fred L <Fred.L.Templin@boeing.com>
Cc: Fernando Gont <fgont@si6networks.com>; IPv6 Operations <v6ops@ietf.org>; 6man@ietf.org
Subject: Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)

On Feb 18, 2021, at 2:46 PM, Templin (US), Fred L <Fred.L.Templin@boeing.com<mailto:Fred.L.Templin@boeing.com>> wrote:
I actually think HITs are a bit of a gray area. According to RFC7343, they are
formed from the GUA prefix 2001:20::/28 but the remaining bits following
the ::/28 prefix are cryptographically generated and hence non-aggregatable.
That means that there is no way to represent a group of them in the routing
system using any other prefix length than /128.

RFC 4007 doesn’t say that they can be aggregated. It just says that they are globally unique.

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