[Click] About Classifier

[jiangmeng1272 at sina.com]

Hi,
I am trying to develop a pragram with IPEncap. But when I want to use the element of Classifier, I am confused. I only know 
12/0806 20/0001 represent ARP requests; 12/0806 20/0002 represent ARP reples; 12/0800  represent IP packets and - represent others. But I don't know  which "offset/value" can represent IP-in-IP packets.Like following picture,how to represent each kind ? 
please help me.

Thank you
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