Working ok on OS X 10.11.3 BUT had to reboot (combination of times) before I saw it show up.
Installed drivers from realtek; rebooted mac; (had to do this 2x - 2nd time I disconnected Tetra from MAC). Then I noticed USB 10/100 LAN adaptor show up in System Information -> Network. Then I connected Tetra, no DHCP, i rebooted Tetra, boom, got IP.
Took few times before I actually saw things working BUT had to reboot/re-connect few times, that did the trick for me.