radiotap on linux

[Matthew Belcher <matt () mattbelcher com>]

Hi all,

I'm working on setting up radiotap header capture on Linux. I'm running the
latest kernel (2.6.16.18) with the radiotap extensions compiled in. I'm using
the madwifi-ng driver with an Atheros card. I pulled the latest tcpdump from
CVS. It looks like tcpdump is receiving the radiotap packets, but it can't
decode them. Here's the output I get:

21:22:43.157339 unknown IEEE802.11 frame type (3)(header) unknown IEEE802.11
frame type (3)unknown 802.11 frame type (3)
        0x0000:  ffff ffff ffff 0002 6f21 e671 0806 0321
        0x0010:  0800 0604 0001 0002 6f21 e671 c0a8 0101
        0x0020:  0000 0000 0000 c0a8 0102

Has anyone been able to get this to work? 

Thanks,
Matt Belcher
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