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> Wed, 06 January 2021 17:33 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: Wed, 6 Jan 2021 12:33:00 -0500
In-Reply-To: <035a725a-19bf-efae-bf13-15e8dae4cc97@si6networks.com>
Cc: Gert Doering <gert@space.net>, IPv6 Operations <v6ops@ietf.org>, Philip Homburg <pch-ipv6-ietf-7@u-1.phicoh.com>, ipv6@ietf.org
To: Fernando Gont <fgont@si6networks.com>
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On Jan 6, 2021, at 12:26 PM, Fernando Gont <fgont@si6networks.com> wrote:
> e.g., for thinks like mDNS, you'd only bind() and listen on your ULAs, if any.

mDNS is link-local, so you can actually use your LLA for that (and we do). But e.g. if you are using SRP (https://tools.ietf.org/html/draft-ietf-dnssd-srp-07), then it makes sense to push your GUA and your ULA and bind to both, or to INADDR_ANY (if you want to be globally reachable). I would expect the SRP server to do the work of figuring out on which DNS server to publish the ULA and on which to publish the GUA.