[156342] in North American Network Operators' Group
Re: Big Temporary Networks
daemon@ATHENA.MIT.EDU (William Herrin)
Sat Sep 15 21:54:07 2012
In-Reply-To: <29035924.25034.1347758299003.JavaMail.root@benjamin.baylink.com>
From: William Herrin <bill@herrin.us>
Date: Sat, 15 Sep 2012 21:52:47 -0400
To: Jay Ashworth <jra@baylink.com>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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?
I don't have any experience with it, but here's what Google told me:
http://www.wireless-nets.com/resources/tutorials/802.11_multicasting.html
"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 =93DTIM interval=94). [...] default 100
millisecond beacon interval"
http://www.wi-fiplanet.com/tutorials/article.php/3433451
"all it takes is one wireless client using 802.11 power saving to
cause the access point to buffer multicast frames for all clients, and
you may not be able to control whether or not users switch on power
save mode."
Regards,
Bill Herrin
--=20
William D. Herrin ................ herrin@dirtside.com bill@herrin.us
3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
Falls Church, VA 22042-3004
