Etherpeek looks like it might work. Although my initial test indicated Etherpeek is flawed.
1) I started Etherpeek on my host machine
2) I started a massive file transfer (web to computer) on another machine
3) The transfer completed successfully about an hour later (500,000,000 bytes copied)
4) Etherpeek only reported about 100,000 bytes for the entire transfer
But the product has many settings and lots of choices so I will reserve judgement for now.
Thanks for the suggestion.