[ipv6-wg] Rquirements for VPN

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.
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best regards
Christian Bretterhofer
Enterprise User:
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