Comment # 20
on bug 9586
from Emburey
(In reply to comment #15)
> (In reply to comment #11)
> > (In reply to comment #2) PLEASE SEE INLINED
> >
> > > What do the bits in the "flags", "status", and "flagsN" (presumably meaning
> > > "802.11n flags") fields mean? Without being told that, we cannot dissect
> > > them.
> > >
> > [emburey] These 3 are few of the fields that internally represent a
> > combination of certain factors (like control frame indication, WEP,
> > bandwidth range..) of a packet. So a mere binary representation of them
> > should be sufficient.
>
> Sufficient for those who either don't care what the bits mean or who already
> know what the bits mean, but that's not necessarily the case for all people
> reading these captures. What do the bits mean?
In the fields 'flags' 'status' 'flagsN', after doing a binary conversion,
please follow the representation of each bits:
field 'flag'
0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
| | | | | | | |
| | | | | | | |- Is a Dot11 Control type frame
| | | | | | |------ Has CRC error
| | | | | |----------- Has frame error
| | | | |---------------- -nil-
| | | |--------------------- -nil-
| | |-------------------------- -nil-
| |------------------------------- -nil-
|------------------------------------ -nil-
field 'status'
0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
| | | | | | | |
| | | | | | | |- -nil-
| | | | | | |------ -nil-
| | | | | |----------- Dot11 WEP
| | | | |---------------- With decrypt error
| | | |--------------------- -nil-
| | |-------------------------- -nil-
| |------------------------------- With short preamble
|------------------------------------ -nil-
field 'flagsN'
(first 23 bits) 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
| | | | | | | | | |
| | | | | | | | | |- 802.11ac 20MHz
lower
| | | | | | | | |------ 802.11ac 20MHz
upper
| | | | | | | |----------- 802.11ac 40MHz
| | | | | | |---------------- 802.11ac HALF GI
| | | | | |--------------------- 802.11ac FULL GI
| | | | |-------------------------- 802.11ac AMPDU
| | | |------------------------------- 802.11ac AMSDU
| | |------------------------------------ -nil-
| |----------------------------------------- 802.11ac future
use
|----------------------------------------------------- -nil-
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