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Re: [v6ops] ULA precedence [Thoughts about wider operational input]

Vasilenko Eduard <vasilenko.eduard@huawei.com> Mon, 25 April 2022 07:57 UTC

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From: Vasilenko Eduard <vasilenko.eduard@huawei.com>
To: Erik Auerswald <auerswald@fg-networking.de>
CC: Nick Buraglio <buraglio@es.net>, v6ops list <v6ops@ietf.org>, 6man list <ipv6@ietf.org>
Thread-Topic: [v6ops] ULA precedence [Thoughts about wider operational input]
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Date: Mon, 25 Apr 2022 07:57:05 +0000
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Subject: Re: [v6ops] ULA precedence [Thoughts about wider operational input]
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Hi Erik,
See below
Eduard
-----Original Message-----
From: Erik Auerswald [mailto:auerswald@fg-networking.de] 
Sent: Monday, April 25, 2022 10:48 AM
To: Vasilenko Eduard <vasilenko.eduard@huawei.com>
Cc: Nick Buraglio <buraglio@es.net>; v6ops list <v6ops@ietf.org>; 6man list <ipv6@ietf.org>
Subject: Re: [v6ops] ULA precedence [Thoughts about wider operational input]

Hi Eduard,

On Sun, Apr 24, 2022 at 08:12:29PM +0000, Vasilenko Eduard wrote:
> [...]
> 2. Attach a special Label (redundant action because FC/7 already has 
> unique Label=13)

The different label to differentiate between locally used ULA prefix(es) and the remaining ULA space is intentional.
[EV] Why?
I do not understand the advantage to populate more prefixes into the host
If the site would have many ULA prefixes.

> Imagine the situation where only one router on the link announces ULA 
> PIO, but the other one - GUA PIO.  (Routers are not in sync for 
> announcements).

Using different first hop gateways for GUA and ULA is another problem.  It would be nice if hosts would (optionally) not consider a gateway announcing a ULA prefix as default gateway, but only for ULA reachability.
[EV] Nope. It is better to revert the logic: decide about the source address first (needed anyway for MHMP) only then to decide about the next-hop.

> [...]

Kind regards,
Erik
--
Dipl.-Inform. Erik Auerswald
Gesellschaft für Fundamental Generic Networking mbH
Geschäftsführung: Volker Bauer, Jörg Mayer
Gerichtsstand: Amtsgericht Kaiserslautern - HRB: 3630

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