Can be used in conjunction with https://github.com/vjmuzik/FNET FNET also contains an example using this driver
USB driver for Teensy 3.6/4.0 to use an ASIX USB to Ethernet adapter This is currently being tested with an AX88772B chipset although it may work for others or need some tweeking for chip specific commands.
Anyone interested can purchase this or one similar from Amazon: https://www.amazon.com/gp/product/B00M77HLII/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1