Big Temporary Networks

Jay Ashworth jra at
Sun Sep 16 16:22:57 UTC 2012

----- Original Message -----
> From: "Masataka Ohta" <mohta at>

> Jay Ashworth wrote:
> > You're saying that *receiving* multicast streams over WLAN works
> > poorly?
> Multicast/broadcast over congested WLAN works poorly, because
> there can be no ACK.
> That is, multicast/broadcast packets lost by collisions are
> never sent again.

Well, yes, but that wasn't what Bill was talking about.  He was talking about
AP's being "nice" to associated clients who are in powersave mode, at the
expensive of all the other connected clients, by buffering multicast packets
until one or more DTIM frames are sent.

We expect live streams to drop a packet here and there; that's what buffering
is for... and why television proper still exists.

-- jra
Jay R. Ashworth                  Baylink                       jra at
Designer                     The Things I Think                       RFC 2100
Ashworth & Associates         2000 Land Rover DII
St Petersburg FL USA               #natog                      +1 727 647 1274

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