If I flip the protocol to be 3 (Host Ethernet Raw), then it starts to show up on Wireshark.
BTW - If I flip the IP # via NETEDIT to something different, and load up a ladder using the new IP # and run it, Wireshark still reports the ecom100 still send stuff out as the old IP #.
At least until the power gets rebooted - so maybe I better retry my tests and cycle the power after each new ladder gets loaded.