Congratulations to the Proxmox Team and PVE 9.0 was done well.
NB: Anyone should ensure /boot has enough free space before upgrading, I presume.
Seamless upgrade from PVE 8.4 by help of the in-place upgrade procedure for pve-no-subscription...
Moin,
vielleicht lohnt sich ein Blick auf:
https://pve.proxmox.com/wiki/Setup_Simple_Zone_With_SNAT_and_DHCP
https://pve.proxmox.com/pve-docs/chapter-pvesdn.html#pvesdn_install_dhcp_ipam
Viel Erfolg!