ssh -L5959:127.0.0.1:5900 root@<VPS IP>

apt update
apt install qemu-system-x86 --no-install-recommends
cd /dev/shm
wget https://enterprise.proxmox.com/iso/proxmox-ve_9.1-1.iso
 
 
qemu-system-x86_64 -enable-kvm -netdev type=user,id=mynet0 -device virtio-net-pci,netdev=mynet0 -m 4G -drive file=/dev/sdb,format=raw,if=virtio -vga qxl -spice port=5900,addr=127.0.0.1,disable-ticketing=on -daemonize -cdrom proxmox-ve_9.1-1.iso -boot d

remote-viewer spice://127.0.0.1:5959

Setup Simple Zone With SNAT and DHCP

Although SDN setups ifupdown2's ip-forward on it still requires to add global forwarding enable:

/etc/sysctl.d/forwarding.conf

net.ipv4.ip_forward=1