[EMAIL PROTECTED] wrote:

>     ppp[0:2]=0xc021 is a capture filter, not dispaly filter.
>     I have solved this problem, because in my case, ppp is encapsulated in
> PPPoE, not directly in Ether,

Presumably you mean "PPP is encapsulated over Ethernet using PPPoE, 
rather than being the link layer".

> so ppp[0:2]=0xc021 can not capture PPP LCP
> packets.

At least with the current top-of-tree CVS version of libpcap, the expression

        pppoes and ppp proto 0xc021

should do what you want (assuming there is any LCP traffic in the PPPoE 
session).
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