For network interfaces whose addressing is controlled directly by PVE (i.e., host nodes, containers), there should be an option (enabled by default) for IPv6 privacy extensions. Preferably, this option could be toggled regardless of IPv6 addressing mode (static / SLAAC / DHCP) (on systems using systemd-networkd at least, the private address is generated and used even when a static address is set).
Examples:
In the /etc/network/interfaces file, under inet6 auto set privext=2.
For containers using systemd-networkd, set IPv6PrivacyExtensions=true.
Examples:
In the /etc/network/interfaces file, under inet6 auto set privext=2.
For containers using systemd-networkd, set IPv6PrivacyExtensions=true.