VMs Unable to Connect to Internet in Proxmox VE on Scaleway Elastic Metal Server

[W1sebyt3s]

Hello Proxmox Community,

I am experiencing an issue where VMs hosted on a Proxmox VE 8 environment installed on a Scaleway Elastic Metal server cannot connect to the internet. However, the host system itself has internet connectivity (verified with proxmox shell). Here are the details and what I've tried so far:

Environment:

• Host System: Proxmox VE 8 on Scaleway Elastic Metal server.
• Network Setup: Using a Linux Bridge (vmbr0) configured with static IPs.
• Affected VMs: Ubuntu Server 24.04 LTS (among others).
• 

Issue Description:

• The VMs are configured to use vmbr0 (the default configuration) but cannot ping outside networks (e.g., 8.8.8.8) despite the host system having no such issues.
• Attempts to ping the gateway from inside the VMs fail, indicating a potential issue with the VMs reaching even the local network gateway.

Configuration Details:

• Bridge Configuration (vmbr0):
  • IP: 51.158.X.75/24
  • Gateway: 51.158.X.1
  • Bridge ports: eno1
  • 
• VM Configuration (e.g., Ubuntu 24.04 VM):
  • Initially attempted static IP configuration via /etc/netplan/ with no success.
  • Reverted to the default configuration, but the issue persists.
  • 

Troubleshooting Steps Taken:

1. Verified the VM is properly connected to vmbr0.
2. Checked and corrected Netplan configuration for syntax and correctness.
3. Applied settings with sudo netplan apply and checked for errors.
4. Tested network connectivity extensively from the VM to no avail.
5. Reviewed firewall settings on the host and VMs to ensure no rules interfere with network traffic.
6. Inspected physical connections and settings in the Scaleway control panel for misconfigurations or relevant notices.

Despite these efforts, the VMs cannot access the Internet or the local network gateway. I would appreciate any insights or suggestions on what might be causing these connectivity issues and how to resolve them. Has anyone else experienced similar issues, or does anyone have ideas on troubleshooting steps I might have overlooked?

Thank you in advance for your assistance!