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echo 'deb [arch=arm64] https://mirrors.apqa.cn/proxmox/debian/pve bookworm port'>/etc/apt/sources.list.d/pveport.list curl -L https://mirrors.apqa.cn/proxmox/debian/pveport.gpg -o /etc/apt/trusted.gpg.d/pveport.gpg
apt update && apt full-upgrade apt install ifupdown2 apt install proxmox-ve postfix open-iscsi
In a regular Proxmox install this interface is created automatically. At least that was my experience.
But on the Pi5, no interfaces files existed. Neither /etc/network/interfaces nor /etc/network/interfaces.d/*.
So i had to create it manually
sourceeth0vmbr0 bridge interface# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
#source /etc/network/interfaces.d/*
auto lo
iface lo inet loopback
#auto enp1s0
#iface enp1s0 inet dhcp
#iface enp1s0 inet static
iface eth0 inet manual
auto vmbr0
iface vmbr0 inet static
address 192.168.178.26/24
gateway 192.168.178.1
bridge-ports eth0
bridge-stp off
bridge-fd 0
Restart network after creating the interfaces file
systemctl restart networking.service