Stig Bjørlykke wrote:
> $ sudo tcpdump -i wlt1
> tcpdump: WARNING: wlt1: no IPv4 address assigned
> tcpdump: unsupported data link type IEEE802_11_RADIO_AVS
Sigh. Yeah, I discovered that tcpdump didn't support AVS recently
(testing it on a Mac mini running Leopard). I checked a fix into the
main and 1.0 tcpdump branches.
What happens if you do
sudo tcpdump -i wlt1 -w /dev/null
(in that case, it doesn't need to understand the link-layer type, as it
just writes out the raw packets without dissecting them)?
> $ tcpdump -V
> tcpdump version 3.9.8
> libpcap version 0.9.5
>
> But I'm sure I have captured wireless on this computer with AVS headers
> before.
Before, or after, upgrading to 10.4.11?
Perhaps the driver was using DLT_PRISM_HEADER (which can also be used
for AVS headers), or perhaps it was using radiotap rather than AVS headers.
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