Fixing Network Issues in Proxmox After Adding an NVMe SSD

proxmox-network-issues.md

• Fixing Network Issues in Proxmox After Adding an NVMe SSD

  • Overview

    • When adding an NVMe SSD to a Lenovo ThinkCentre M700 running Proxmox, the network interface names may change due to PCI enumeration shifts. This can cause OPNsense (running as a Proxmox VM) to lose access to its network interfaces. This guide explains how to diagnose and fix this issue.

  • Step 1: Identify Network Interface Changes

  • Check Available Network Interfaces in Proxmox

    • Run the following command on the Proxmox host:

      ip link show
      

      This will list all network interfaces. If your primary NIC was previously enp1s0 and is now enp2s0, the system has renamed it.

  • Step 2: Update Proxmox Network Configuration

    • If the network adapter name has changed, update the Proxmox configuration.

    • Edit /etc/network/interfaces

    • In proxmox --> pve1 node --> shell: Open the network configuration file:

      nano /etc/network/interfaces
      

      Locate the section configuring vmbr0, which may look like this:

      auto vmbr0
      iface vmbr0 inet static
        address 192.168.1.2/24
        gateway 192.168.1.1
        bridge-ports enp1s0
        bridge-stp off
        bridge-fd 0
      

      Change enp1s0 to enp2s0:

      auto vmbr0
      iface vmbr0 inet static
        address 192.168.1.2/24
        gateway 192.168.1.1
        bridge-ports enp2s0
        bridge-stp off
        bridge-fd 0
      

      Save and exit (Ctrl + X, then Y, then Enter).

    • Restart Networking

      Apply the changes:

      systemctl restart networking
      

      If the issue persists, reboot Proxmox:

      reboot
      

  • Step 3: Verify Network Settings in Proxmox UI

    • Go to Datacenter → Your Node (eg pve1) → Network
    • Ensure vmbr0 is using enp2s0.
    • If the network is still down, remove and re-add the network bridge in the Proxmox UI.

  • Step 4: Reconfigure OPNsense Interfaces

    • Once Proxmox is correctly configured:
    • Start the OPNsense VM logseq.order-list-type:: number
    • Open the console. logseq.order-list-type:: number
    • Select Option 1: Assign Interfaces. logseq.order-list-type:: number
    • Reassign LAN and WAN to the correct interfaces. logseq.order-list-type:: number
    • Save and exit. logseq.order-list-type:: number