On Mon, 10 Aug 2015, Henning Rogge wrote:
On Mon, Aug 10, 2015 at 9:32 AM, Mikael Abrahamsson <[email protected]> wrote:
IETF standards generally assume that multicast and unicast are delivered
with a similar level of packetloss (which is low).
Not all 802.11 implementations have the multicast ACK mechanism implemented,
thus it would seem that multicast will be less likely to get delivered to
the recipient over these 802.11 implementations.
For me, it seems these 802.11 broadcast/multicast ACK functions should be
"mandatory" to implement if the device wants to support IPv4 and IPv6
networks.
Excuse me, multicast ACKs on 802.11?
I know that some implementations/stacks split up multicast into
several unicasts (which will then be acked and will have
retransmissions), but I have yet to hear about multicast ACKs in the
IEEE 802.11 standard.
Donald Eastlake posted this a few days ago:
"- 802.11 does have a feature called GCR -- Groupcast With Retries,
which was part of the 802.11aa amendment, although it is not widely
implemented. It includes such features as a way for the AP to send
several multi-destination frames and then, using unicast, to poll
associated stations for a bit map of which of those frames they
correctly received (BlockAck) and a feature for the AP to
spontaneously transmit a multi-destination frame more than once
without causing confusion for improved reliability."
--
Mikael Abrahamsson email: [email protected]
_______________________________________________
homenet mailing list
[email protected]
https://www.ietf.org/mailman/listinfo/homenet
