Re: [v6ops] draft-ietf-6man-grand : saving lookups

Fred Baker <fredbaker.ietf@gmail.com> Tue, 11 August 2020 20:47 UTC

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From: Fred Baker <fredbaker.ietf@gmail.com>
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Date: Tue, 11 Aug 2020 13:47:28 -0700
Cc: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>, IPv6 List <ipv6@ietf.org>, "v6ops@ietf.org" <v6ops@ietf.org>
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Subject: Re: [v6ops] draft-ietf-6man-grand : saving lookups
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> Do WiFi base stations implement this correctly, or do they broadcast?

I would expect that WiFi Base Stations multicast. However, understand what that means. 

On the air interface, they are either transmitting or not. In the receiving NIC, the question is whether or not they store the message; if they are not configured to receive a certain multicast group, regardless of transmission type, they receive and store the message and then forget that they have done so, re-using the buffer for the next message. If they forward the message on, it uses the bandwidth on the other side, whatever it is, with the same destination address. 

The place where one might distinguish “broadcast” from “multicast” is on a data center switch, where “multicast” might mean keeping a list of relevant ports and only sending to them. They want to send a message once. If they are sending the same message several times, “to whom” is an important question.