modifier hosts & hostname

curl -#o /etc/apt/trusted.gpg.d/proxmox-release-bullseye.gpg http://download.proxmox.com/debian/proxmox-release-bullseye.gpg

echo “deb http://download.proxmox.com/debian/pve bullseye pve-no-subscription” > /etc/apt/sources.list.d/pve-install-repo.list

apt update apt dist-upgrade

apt purge firmware-bnx2x firmware-realtek firmware-linux-free apt-get install proxmox-ve

nano /etc/network/interfaces

auto vmbr0 #private sub network iface vmbr0 inet static

address 172.31.32.1/24
bridge-ports none
bridge-stp off
bridge-fd 0

post-up echo 1 > /proc/sys/net/ipv4/ip_forward
post-up iptables -t nat -A POSTROUTING -s '172.31.32.0/24' -o enp2s0 -j MASQUERADE
post-down iptables -t nat -D POSTROUTING -s '172.31.32.0/24' -o enp2s0 -j MASQUERADE

https://pve.proxmox.com/wiki/Network_Configuration https://community.hetzner.com/tutorials/install-and-configure-proxmox_ve#step-1---installation