Re: Got "Radiotap data goes past the end of the radiotap header" for Npcap's radiotap header.

[Guy Harris <guy () alum mit edu>]

On Apr 9, 2016, at 12:24 AM, Yang Luo <hsluoyb () gmail com> wrote:

> I have added Radiotap header to Windows. Currently only Flags, Channel and Antenna Signal are supported.
>
> The whole header with Radiotap data is 14 bytes:
> 8 bytes header + 1 byte Flags + 4 bytes Channel + 1 byte Antenna Signal.

It should be

        8 bytes header

        1 byte Flags

        1 byte padding, to put the Channel field on a 2-byte boundary

        4 bytes Channel

        1 byte Antenna signal

for a total of 15 bytes.  See the "Alignment in Radiotap" section of

        http://www.radiotap.org

If you add a Rate field after Flags, however, you *wouldn't* put the padding field there, as the Rate field is also 1 
byte long, and there's no need for padding after a 1-byte Flags field and a 1-byte Rate field if a Channel field 
follows the Rate field.
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