After several attempts, decided to ask a question in the forum.
Intuition tells me that this is due PVE specific scripts:confused:
I can't set up IPV6 forwarding is not one of those ways?
1. echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
2. sysctl -w net.ipv6.conf.all.forwarding=1
3. echo...