netdev - What is the "ll header" of a PPP Interface?

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Date:	Mon, 05 Oct 2009 11:30:20 +0200
From:	Peter Daum <gator_ml@...oo.de>
To:	netdev@...r.kernel.org
Subject:  What is the "ll header" of a PPP Interface?

Hi,

I occasionally get syslog messages about "martians" coming in on a PPP interface.
Normally, the reported ll header is the 2 involved MAC addresses and the ethernet
frame type. For the PPP interface however, the reported ll header is 22 bytes long
and I can't find any information about the significance of it.

Can somebody here maybe enlighten me?

Regards,
                         Peter

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