Paket Sniffer MAC Protcol LCP

Hello,

I simply wanna sniff some PPPoE LCP Pakets from one of our Customers. Am I doing something wrong?

PPP LCP (MAC Protocol) should be 0xc021 in hex what i set in the filter? If I set the interface to Eth-Port i can only see the PPPoE Session Stream.
LCP.png
When i’m sniffing the complete PPPoE Session i can see the LCP Pakets showing in Wireshark.
LCP2.png
Maybe someone can tell me my mistake? Best regards