Configuration help of Proxmox Network /etc/network/interfaces and Guest (Ubuntu) Netplan

[frankhommers]

I can't figure out how to configure the host, so that I can assign IP's from the subnet to a VM. I also need help there on how to do this for Ubuntu 22 -> Netplan.
I also want a private LAN shared across all VM's.

Help would be very much appreciated.

I anonimized the IP addresses by replacing two octets with A.B, and two other octets with C.D


IP addresses:

• IP: 65.A.B.92
• Gateway: 65.A.B.65
• Netmask: 255.255.255.192
• Broadcast: 65.A.B.127

Now I also ordered an extra subnet, and that has those details:

Extra Subnet:

• Subnet: 95.C.D.120 / 29
• IPs: 95.C.D.120 - 95.C.D.127
• Gateway: 65.A.B.92
• Subnet: 255.255.255.248
• Broadcast: 95.C.D.127

This is my non-working configuration so far:

auto lo
iface lo inet loopback

# management interface
auto enp41s0
iface enp41s0 inet static
  address  65.A.B.92
  netmask 255.255.255.255
  pointopoint  65.A.B.65
  gateway  65.A.B.65


# private lan
auto vmbr0
iface vmbr0 inet static
        address 10.200.0.1/24
        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 '10.200.0.0/24' -o vmbr1 -j MASQUERADE
        post-up   iptables -t nat -D POSTROUTING -s '10.200.0.0/24' -o vmbr1 -j MASQUERADE


# this is for all the vm's that need to be exposed to the outside world
auto vmbr1
iface vmbr1 inet static
  address 95.C.D.121
  netmask 255.255.255.248
  bridge_ports none
  bridge_stp off
  bridge_fd 0

 

[frankhommers]

I managed to get part of this setup working with this guide:

https://www.sysorchestra.com/proxmox-5-on-hetzner-root-server-with-ipv4/