tcpdump mailing list archives

Re: tcpdump - prism headers


From: Guy Harris <guy () alum mit edu>
Date: Wed, 22 Feb 2006 01:02:55 -0800

David Young wrote:

In principle, the radiotap header length is variable, but in practice, it
is virtually always 64 bytes; this is an accomodation for libpcap/tcpdump,
which historically could not handle variable-length headers.  (I haven't
been paying close attention to notice whether libpcap/tcpdump supports
variable lengths, now.)

Not in all cases (not for Token Ring headers with routing information, and not for 802.11 headers with four addresses, for example), but it *does* support variable-length radiotap headers in the 0.9.x release.
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