[156343] in North American Network Operators' Group
Re: Big Temporary Networks
daemon@ATHENA.MIT.EDU (Jay Ashworth)
Sat Sep 15 21:56:24 2012
Date: Sat, 15 Sep 2012 21:55:41 -0400 (EDT)
From: Jay Ashworth <jra@baylink.com>
To: NANOG <nanog@nanog.org>
In-Reply-To: <CAP-guGUc7KVo9CC8omJO1QAjr5smB7RPsQBWjpjgy+cc6oiv9w@mail.gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
----- Original Message -----
> From: "William Herrin" <bill@herrin.us>
> On Sat, Sep 15, 2012 at 9:18 PM, Jay Ashworth <jra@baylink.com> wrote:
> > You're saying that *receiving* multicast streams over WLAN works
> > poorly?
>=20
> I don't have any experience with it, but here's what Google told me:
>=20
> http://www.wireless-nets.com/resources/tutorials/802.11_multicasting.html
>=20
> "When any single wireless client associated with an access point has
> 802.11 power-save mode enabled, the access point buffers all multicast
> frames and sends them only after the next DTIM (Delivery Traffic
> Indication Message) beacon, which may be every one, two, or three
> beacons (referred to as the =E2=80=9CDTIM interval=E2=80=9D). [...] defau=
lt 100
> millisecond beacon interval"
Thanks for doing my googling for me, Bill. :-)
I'll do some more; I would sort've expect that might be something the
firmware in enterprise-class APs would handle better (where by better,
I mean "not permitting one client to manhandle the entire network" :-).
Cheers,
-- jra
--=20
Jay R. Ashworth Baylink jra@baylink.=
com
Designer The Things I Think RFC 2=
100
Ashworth & Associates http://baylink.pitas.com 2000 Land Rover =
DII
St Petersburg FL USA #natog +1 727 647 1=
274
