Going by this thread here, I believe this issue to originate with 6.10 when ipvlan was introduced. I've just recently needed to switch from macvlan to ipvlan as my sever started kernel panicking after adding some new hardware (nvme+ram).  if 'Host access to custom networks' is Enabled while using ipvlan the server functions normally in terms of routing, reaching the internet, etc, and the routing table is all good:   root@vault13:~# route Kernel IP routing table Destination Gat