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Re: [dhcwg] I-D Action: draft-ietf-dhc-addr-notification-06.txt

Jen Linkova <furry13@gmail.com> Wed, 15 November 2023 16:55 UTC

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From: Jen Linkova <furry13@gmail.com>
Date: Wed, 15 Nov 2023 17:55:38 +0100
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To: Michael Richardson <mcr+ietf@sandelman.ca>
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Subject: Re: [dhcwg] I-D Action: draft-ietf-dhc-addr-notification-06.txt
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On Wed, Nov 15, 2023 at 10:30 AM Michael Richardson
<mcr+ietf@sandelman.ca> wrote:
> Jen Linkova <furry13@gmail.com> wrote:
>     > - "Signalling Address Registration Support" section is rewritten to
>     > clarify that if the servers answers are inconsistent, the mechanism is
>     > unreliable (as the client can pick up the first reply).
>
> What is the impact of rogue DHCP messages on the network?
> (Yes, DHCPguard, but even if it's enabled on the core switches, there might
> be unmanaged switches closer to the edges... like on people's desks)
>
> I guess I'd rather the client do address registration if it's seen at least
> one server with it enabled.

That's the ideal behaviour and if the client processes all Replies -
that's what would happen.
However, as discussed on the list and during the session, there is no
guarantee that the client would process subsequent Replies when
multiple Replies are received for the given Information-Request. There
is no requirement to process all Replies, so we can't rely on it.

However maybe we shall change "Whenever the client receives and
processes a Reply message without the OPTION_ADDR_REG_ENABLE option,
it MUST stop transmitting ADDR-REG-INFORM messages." to "If none
processed Reply messages received in response for a given message sent
by the client contain OPTION_ADDR_REG_ENABLE option, it MUST stop
transmitting ADDR-REG-INFORM messages."

-- 
Cheers, Jen Linkova

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