The PDF on this site went away, I guess, but it was there yesterday.
If you are running the card in the subject line, there is a note in the compatibility update for High Sierra that the card uses native drivers in macOS, and it is broken. In my build it shows no installed Ethernet cards. The PDF states that there is a bug report filed with apple to have it fixed.
https://www.sonnettech.com/support/charts/highsierra/index.html...
Sonnet GE1000LAB-E Presto Gigabit Ethernet card (DRIVER ON BUG REPORT WITH APPLE)
If you are running the card in the subject line, there is a note in the compatibility update for High Sierra that the card uses native drivers in macOS, and it is broken. In my build it shows no installed Ethernet cards. The PDF states that there is a bug report filed with apple to have it fixed.
https://www.sonnettech.com/support/charts/highsierra/index.html...
Sonnet GE1000LAB-E Presto Gigabit Ethernet card (DRIVER ON BUG REPORT WITH APPLE)