Strange issue on Proxmox V9.1-loss of connection

[solar1434]

Hello .
my system is an intel 13th Gen with 4 x2.5G intel Nics:
my system has 4 Nics.
#A8:B8:E0:05:E2:FC #Lan4 vpro
#A8:B8:E0:05:E2:FB #Lan3
#A8:B8:E0:05:E2:FA #Lan2
#A8:B8:E0:05:E2:F9 #Lan1 .

and my /etc/network/interfaces is a basic one:
##########################
auto lo
iface lo inet loopback

auto enp7s0
iface enp7s0 inet manual

auto enp6s0
iface enp6s0 inet manual

auto vmbr0
iface vmbr0 inet static
address 10.0.0.2/24
gateway 10.0.0.1
bridge_ports enp6s0
bridge_stp off
bridge_fd 0

auto vmbr1
iface vmbr1 inet manual
address 10.0.0.3/24
bridge_ports enp7s0
bridge_stp off
bridge_fd 0
###################
after an hour I moved the system to the storage area and when it booted the same issue again no network.

initially I wanted to improve the installation
I wanted to keep Nic naming to improve the installation by using this conf below, but it failed unless I manually set it up

-------------------------
auto lo
iface lo inet loopback

############################
# Proxmox Management NIC
############################
allow-hotplug eth-proxmox
iface eth-proxmox inet manual


auto vmbr0
iface vmbr0 inet static
address 10.0.0.2/24
gateway 10.0.0.1
bridge-ports eth-proxmox
bridge-stp off
bridge-fd 0


############################
# VM Network NIC
############################
allow-hotplug eth-vm
iface eth-vm inet manual


auto vmbr1
iface vmbr1 inet manual
bridge-ports eth-vm
bridge-stp off
bridge-fd 0
________________________________________
by first Create persistent mappings as below:



sudo nano /etc/systemd/network/10-eth-proxmox.link

----
[Match]
MACAddress=A8:B8:E0:05:E2:F9

[Link]
Name=eth-proxmox
-----
sudo nano /etc/systemd/network/11-eth-vm.link
----
[Match]
MACAddress=A8:B8:E0:05:E2:FA

[Link]
Name=eth-vm
-----
sudo nano /etc/systemd/network/12-eth-lan3.link
----
[Match]
MACAddress=A8:B8:E0:05:E2:FB

[Link]
Name=eth-lan3
-----
sudo nano /etc/systemd/network/13-eth-vpro.link
-------
[Match]
MACAddress=A8:B8:E0:05:E2:FC

[Link]
Name=eth-vpro
-------
Then:


Then:


Then:


sudo update-initramfs -u
sudo reboot

after reboot
I checked
ip a
and got
ip a
eth-proxmox
eth-vm
eth-lan3
eth-vPRO


reboot

but VMbr0 and Vmbr1 are not recognised and therefore no connection unless I manually do this:
*******
ip link set eth-proxmox up
ip link set eth-vm up
ip link set eth-lan3 up
ip link set eth-vpro up
***********

or

ip addr add 10.0.0.2/24 dev eth-proxmox
ip link set eth-proxmox up
ip route add default via 10.0.0.1

to get one NIC up

and then I get my webgui up otherwise the system does not set them up.

I don't understand why?.