As I was wanting to verify my setup against the JUnit test cases, I found the 40+ misc example (http://jnetpcap.com/examples/misc). However, when I tried to run it on my system, I found all kinds of deprecated and invalid syntax. I'm guessing this has something to do with updated code (I'm on 1.4), and possibly running Java 1.6.
Anyways, I went through and fixed most things so the JUnit test run mostly fine. The only thing I'm missing is the expected test-l2tp.pcap file, so my substitute file fails some of the assertions where it expects specific sizes. Is that file posted somewhere where I'm missing it?
I have attached the updated TestPcapJNI.java file (renamed to .txt so it can be uploaded...that's silly) for reference...I'm sure it's not perfect (I couldn't resolve HttpTrafficGenerator), but it's a first stab at updating.