I was able to get rid of many of those warnings following:
https://www.sparklabs.com/forum/t/strange-new-ipv6-warning/1476/1
Nevertheless, I still see:
2021-09-08 18:29:26: WARNING: The DNS server 192.168.100.1 is not routed through the VPN connection. DNS lookups to this server may travel over a different network interface (en0).
I think it could be a misconfiguration at my side…
