Comment # 9
on bug 9754
from Guy Harris
(In reply to comment #8)
> The phone is connected via 11n
...which makes 11ac irrelevant to the discussion, unless the packet was being
sent by the phone to the Mac via the AP, and the AP receives packets 11n
packets and sends them on to the ultimate destination as 11ac packets.
> but at 40MHz, which is not reflected properly. Thats what I dont understand.
It's easy to understand.
If the UDP packet was sent by the iPhone to the AP, with the AP routing it via
something other than 802.11 (e.g., if the iPhone is talking to the Intertubes
and the AP is routing it to the Intertubes over Ethernet), and it was sent as a
40 MHz 11n packet, then there's either a hardware or device driver problem on
the Mac where it's setting the bandwidth in the MCS field of the radiotap
header of the packet as "20 MHz" rather than "40 MHz".
If the UDP packet was sent by the iPhone to another STA on the network, with
the AP sending it on to that host, and if it was sent as a 40 MHz 11n packet
and the version received by the Mac is the version sent to the AP, then it's
the same as the above.
If the Mac received the version sent by the AP to the other STA, then either
the AP sent it as a 20 MHz 11n packet for some reason, in which case there's no
bug, or it sent it as a 40 MHz 11n packet, then it's the same as the above.
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