After reading https://go6.si/wp-content/uploads/2020/10/RIPE554-bis-v_01.pdf I see VPNs as part of the Network Security Equipment. But in my opinium there is not enough definition to be a VPN quality criteria. VPN external Protocol Must support IPv6 clients to IPv6 servers (6-to-6) ( Ipv6 Only) VPN external Protocol Must support IPv4 clients to IPv4 servers (4-to-4) (Ipv4 only) Transport inside of VPN VPN inner Protocol Must support IPv6 clients to IPv6 servers (6-to-6) VPN inner Protocol Must support IPv4 clients to IPv4 servers (4-to-4) VPN inner Protocol should support Dual stack. VPN inner Protocol should support 4in6 6in4 (transition protocols) The Idea from wireguard is maybe also a should the external protocol switch from Ipv6 to Ipv4 or Ipv4 to Ipv6 then the inner protocol should stay connected. Protocols with DNS64/NAT64 support would also help. maybe it fist into this recommendation document. -- --- best regards Christian Bretterhofer Enterprise User: