Proxmox v6 vs v7 Networking Bridge with 2 IP on Hetzner Dedicated Server

[Will A. Zeppeli]

Greetings, dear friends

I have followed this tutorial of Hetzner documentation to setup a Proxmox server with 2 IP in Bridged mode

The primary IP is for management of Proxmox itself, and the secondary IP is for usage in VMs of Proxmox

https://community.hetzner.com/tutorials/install-and-configure-proxmox_ve

This tutorial works great, no questions there.

However, when I try to do exactly the same setup with Proxmox 7, it won't work. I've repeated the process likely more than 10 times and I just can't get it to work on Proxmox 7, while it works perfectly on Proxmox 6.

What's the key config line I'm missing?

Host (Proxmox)

source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback

iface enp0s31f6 inet manual

auto vmbr0
iface vmbr0 inet static
  address MAIN_IP
  hwaddress MAC
  netmask 255.255.255.255
  pointopoint MAIN_IP_GATEWAY
  gateway MAIN_IP_GATEWAY
  bridge_ports enp0s31f6
  bridge_stp off
  bridge_fd 1

Guest (MX Linux)

# interfaces(5) file used by ifup(8) and ifdown(8)

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface

auto ens18
iface ens18 inet static
  address SECOND_IP
  netmask 255.255.255.255
  pointopoint MAIN_IP_GATEWAY
  gateway MAIN_IP_GATEWAY

Thank you so much
Best regards

 

[Michel V]

I have the exact same problem. I guess it is about the correct MAC address. You have the new IP set to another MAC? And then which MAC to the hwaddress?