rfc9119v3.txt   rfc9119.txt 
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In this section, some of the issues related to the use of multicast In this section, some of the issues related to the use of multicast
transmissions over IEEE 802 wireless technologies are described. transmissions over IEEE 802 wireless technologies are described.
3.1.1. Multicast Reliability 3.1.1. Multicast Reliability
Multicast traffic is typically much less reliable than unicast Multicast traffic is typically much less reliable than unicast
traffic. Since multicast makes point-to-multipoint communications, traffic. Since multicast makes point-to-multipoint communications,
multiple acknowledgements would be needed to guarantee reception at multiple acknowledgements would be needed to guarantee reception at
all recipients. However, since there are no ACKs for multicast all recipients. However, since there are no ACKs for multicast
packets, it is not possible for the Access Point (AP) to know whether packets, it is not possible for the AP to know whether or not a
or not a retransmission is needed. Even in the wired Internet, this retransmission is needed. Even in the wired Internet, this
characteristic often causes undesirably high error rates. This has characteristic often causes undesirably high error rates. This has
contributed to the relatively slow uptake of multicast applications contributed to the relatively slow uptake of multicast applications
even though the protocols have long been available. The situation even though the protocols have long been available. The situation
for wireless links is much worse and is quite sensitive to the for wireless links is much worse and is quite sensitive to the
presence of background traffic. Consequently, there can be a high presence of background traffic. Consequently, there can be a high
packet error rate (PER) due to lack of retransmission and because the packet error rate (PER) due to lack of retransmission and because the
sender never backs off. PER is the ratio, in percent, of the number sender never backs off. PER is the ratio, in percent, of the number
of packets not successfully received by the device. It is not of packets not successfully received by the device. It is not
uncommon for there to be a packet loss rate of 5% or more, which is uncommon for there to be a packet loss rate of 5% or more, which is
particularly troublesome for video and other environments where high particularly troublesome for video and other environments where high
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characteristics of DMS: characteristics of DMS:
* Requires 802.11n Aggregate MAC Service Data Units (A-MSDUs). * Requires 802.11n Aggregate MAC Service Data Units (A-MSDUs).
* Individually addressed frames are acknowledged and are buffered * Individually addressed frames are acknowledged and are buffered
for power-save STAs. for power-save STAs.
* The requesting STA may specify traffic characteristics for DMS * The requesting STA may specify traffic characteristics for DMS
traffic. traffic.
* DMS was defined in IEEE Std. 802.11v-2011 [v2011]. * DMS was defined in IEEE Std 802.11v-2011 [v2011].
* DMS requires changes to both AP and STA implementation. * DMS requires changes to both AP and STA implementation.
DMS is not currently implemented in products. See [Tramarin2017] and DMS is not currently implemented in products. See [Tramarin2017] and
[Oliva2013] for more information. [Oliva2013] for more information.
4.6.4. Automatic Multicast Tunneling (AMT) 4.6.4. Automatic Multicast Tunneling (AMT)
AMT [RFC7450] provides a method to tunnel multicast IP packets inside AMT [RFC7450] provides a method to tunnel multicast IP packets inside
unicast IP packets over network links that only support unicast. unicast IP packets over network links that only support unicast.
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Deri, L. and J. Gasparakis, "10 Gbit Hardware Packet Deri, L. and J. Gasparakis, "10 Gbit Hardware Packet
Filtering Using Commodity Network Adapters", RIPE 61, Filtering Using Commodity Network Adapters", RIPE 61,
November 2010, <http://ripe61.ripe.net/ November 2010, <http://ripe61.ripe.net/
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[dot11] IEEE, "Information Technology--Telecommunications and [dot11] IEEE, "Information Technology--Telecommunications and
Information Exchange between Systems - Local and Information Exchange between Systems - Local and
Metropolitan Area Networks--Specific Requirements - Part Metropolitan Area Networks--Specific Requirements - Part
11: Wireless LAN Medium Access Control (MAC) and Physical 11: Wireless LAN Medium Access Control (MAC) and Physical
Layer (PHY) Specifications (includes 802.11v amendment)", Layer (PHY) Specifications (includes 802.11v amendment)",
DOI 10.1109/IEEESTD.2021.9363693, IEEE Std. 802.11-2020, DOI 10.1109/IEEESTD.2021.9363693, IEEE Std 802.11-2020,
February 2021, December 2020,
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[dot11-proxyarp] [dot11-proxyarp]
Hiertz, G., Mestanov, F., and B. Hart, "Proxy ARP in Hiertz, G., Mestanov, F., and B. Hart, "Proxy ARP in
802.11ax", September 2015, 802.11ax", September 2015,
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Wireless LAN Medium Access Control (MAC) and Physical Wireless LAN Medium Access Control (MAC) and Physical
Layer (PHY) Specifications Amendment 2: MAC Enhancements Layer (PHY) Specifications Amendment 2: MAC Enhancements
for Robust Audio Video Streaming", for Robust Audio Video Streaming",
DOI 10.1109/IEEESTD.2012.6204193, IEEE Std. 802.11aa-2012, DOI 10.1109/IEEESTD.2012.6204193, IEEE Std 802.11aa-2012,
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[group_key] [group_key]
"Subject: Why do some WiFi routers block multicast packets "Subject: Why do some WiFi routers block multicast packets
going from wired to wireless?", message to the Super User going from wired to wireless?", message to the Super User
Q & A community, January 2017, Q & A community, January 2017,
<https://superuser.com/questions/730288/why-do-some-wifi- <https://superuser.com/questions/730288/why-do-some-wifi-
routers-block-multicast-packets-going-from-wired-to- routers-block-multicast-packets-going-from-wired-to-
wireless>. wireless>.
[IEEE802.1ak] [IEEE802.1ak]
IEEE, "Local and Metropolitan Area Networks Virtual IEEE, "Local and Metropolitan Area Networks Virtual
Bridged Local Area Networks - Amendment 07: Multiple Bridged Local Area Networks - Amendment 07: Multiple
Registration Protocol", DOI 10.1109/IEEESTD.2007.380667, Registration Protocol", DOI 10.1109/IEEESTD.2007.380667,
IEEE Std. 802.1ak-2007, June 2007, IEEE Std 802.1ak-2007, June 2007,
<https://www.ieee802.org/1/pages/802.1ak.html>. <https://www.ieee802.org/1/pages/802.1ak.html>.
[ietf_802-11] [ietf_802-11]
Stanley, D., "IEEE 802.11 multicast capabilities", Stanley, D., "IEEE 802.11 multicast capabilities",
November 2015, <https://mentor.ieee.org/802.11/ November 2015, <https://mentor.ieee.org/802.11/
dcn/15/11-15-1261-03-0arc-multicast-performance- dcn/15/11-15-1261-03-0arc-multicast-performance-
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[mc-prob-stmt] [mc-prob-stmt]
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skipping to change at line 1182 skipping to change at line 1182
[uli] Kinney, P., "LLC Proposal for 802.15.4", September 2015, [uli] Kinney, P., "LLC Proposal for 802.15.4", September 2015,
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[v2011] IEEE, "Information technology -- Local and metropolitan [v2011] IEEE, "Information technology -- Local and metropolitan
area networks -- Specific requirements -- Part 11: area networks -- Specific requirements -- Part 11:
Wireless LAN Medium Access Control (MAC) and Physical Wireless LAN Medium Access Control (MAC) and Physical
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Acknowledgements Acknowledgements
This document has benefitted from discussions with the following This document has benefitted from discussions with the following
people, in alphabetical order: Mikael Abrahamsson, Bill Atwood, people, in alphabetical order: Mikael Abrahamsson, Bill Atwood,
Stuart Cheshire, Donald Eastlake 3rd, Toerless Eckert, Jake Holland, Stuart Cheshire, Donald Eastlake 3rd, Toerless Eckert, Jake Holland,
Joel Jaeggli, Jan Komissar, David Lamparter, Morten Pedersen, Pascal Joel Jaeggli, Jan Komissar, David Lamparter, Morten Pedersen, Pascal
Thubert, and Jeffrey (Zhaohui) Zhang. Thubert, and Jeffrey (Zhaohui) Zhang.
skipping to change at line 1217 skipping to change at line 1217
Email: michael.mcbride@futurewei.com Email: michael.mcbride@futurewei.com
Dorothy Stanley Dorothy Stanley
Hewlett Packard Enterprise Hewlett Packard Enterprise
6280 America Center Dr. 6280 America Center Dr.
San Jose, CA 95002 San Jose, CA 95002
United States of America United States of America
Phone: +1 630 363 1389 Phone: +1 630 363 1389
Email: dstanley1389@gmail.com Email: dorothy.stanley@hpe.com
Warren Kumari Warren Kumari
Google Google
1600 Amphitheatre Parkway 1600 Amphitheatre Parkway
Mountain View, CA 94043 Mountain View, CA 94043
United States of America United States of America
Email: warren@kumari.net Email: warren@kumari.net
Juan Carlos Zuniga Juan Carlos Zuniga
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