Big Temporary Networks

William Herrin bill at herrin.us
Sun Sep 16 01:52:47 UTC 2012


On Sat, Sep 15, 2012 at 9:18 PM, Jay Ashworth <jra at 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 “DTIM interval”). [...] 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





-- 
William D. Herrin ................ herrin at dirtside.com  bill at herrin.us
3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
Falls Church, VA 22042-3004



More information about the NANOG mailing list