>> what am I doing wrong? If I type "tcpdump -xXni sip0 -s 0" tcpdump shows
>> me the complete packet data of all ethernet packets. If I use pppoe0
>> instead of sip0 tcpdump ignores "-xX" and shows PPPoE + TCP/IP headers
>> only.
>
>Very interesting - never noticed this before.
>
>Please file a PR (category "bin") against tcpdump.
>
>This is probably caused by the different link layer encapsulation passed
>to bpf (pppoe0 does tap full PPPoE frames, not PPP frames, while ppp0 sends
>PPP frames with async encapsulation to bpf)

	i remember some related fix committed to tcpdump.org repository
	yesterday.  if possible, please try latest tcpdump from tcpdump.org
	anoncvs.

itojun