Proxmox host setup instructions for setting up IPv6 using DHCPv6 or static configuration. This configuration example also allows the default port 8006 on 443 so that you can directly access your Proxmox server without typing :8006 in the end. Iptable example for Proxmox IP addresses are fd00::10 and 192.168.1.10 for allowing direct Proxmox access on port 443.
Static config
Proxmox bridge example with static IPv6 and IPv4, change the IPs accordingly.
DHCP config
Proxmox bridge example with DHCPv6 for IPv6 and DHCPv4 for IPv4, change the IPs accordingly.
Now edit the file /etc/dhcp/dhclient.conf and add this code at the bottom of the file.
Then run these commands in the Proxmox terminal rm /var/lib/dhcp/* and systemctl restart networking
Finally don't forget to add net.ipv6.conf.vmbr0.accept_ra=2 to your /etc/sysctl.conf file and reboot ProxMox.
Let me know if you have any comments or if there is any error in this guide.