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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)

Ted Lemon <mellon@fugue.com> Sat, 13 February 2021 20:47 UTC

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From: Ted Lemon <mellon@fugue.com>
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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)
Date: Sat, 13 Feb 2021 15:47:07 -0500
In-Reply-To: <e9479846-7c0e-df4e-67a6-0d2db4cdeec1@si6networks.com>
Cc: Brian E Carpenter <brian.e.carpenter@gmail.com>, Fred Baker <fredbaker.ietf@gmail.com>, IPv6 Operations <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>
To: Fernando Gont <fgont@si6networks.com>
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On Feb 13, 2021, at 3:18 PM, Fernando Gont <fgont@si6networks.com> wrote:
> BUt that's again ULAs being special. And they usually have properties of "private" addresses -- e.g., can generally be expected to be valid if your link to your ISP goes down, are more unlikely of being renumbered, etc.

If your link is numbered with ULAs, then you’ll choose a ULA whenever you’re communicating with another ULA, because of the longest match rule.

Source address selection is below the level of naming, so you’ve already picked your destination address by the time you start doing it.

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