I already tried doing this. Genymotion refuses to start with "The Genymotion virtual device could not get an IP address." but nothing happend. And also here Not ab
I was facing the same issue on Mac OS Sierra. I simply quit VBoxNetDHCP and ran the Genymotion virtual device again - this time it ran smoothly. This is how you can try the same:
Open Activity Monitor (You can use Spotlight Search for this) -> Select the CPU tab -> in the search bar on the right enter DHCP -> in the results, if visible, select VBoxNetDHCP -> click on the cross button on the top left -> choose Quit -> Re-run your virtual device and it should work this time :)