reply to dnoyeB
Re: Destination unreachable, USG20 confused I was able to make the device temporarily work by injecting the ip/MAC association through CLI when I saw the ARP in the wireshark log being ignored.
This confirms the issue. I have no way however to make a permanent association...
"Then said I, Wisdom [is] better than strength: nevertheless the poor man's wisdom [is] despised, and his words are not heard. " Ecclesiastes 9:16