Any Proxmox experts able to help with networking?

Curious Pineapple · May 1, 2020

I've just been working on a VM host using PM. I installed it on an old Dell t5400, and the performance was horrific. I used that as it was ready to use and all I wanted to test was PCI-e passthrough.

I've built up another machine now (Z800 with Dual CPU) and swapped the drive over. I've changd the interface name in /etc/networking/interfaces and I can access the interface just fine. When I start a VM, the host looses network connectivity and running 'ip link show' reveals that the 2 network interfaces (enp1s0 and enp2s0) have been replaced with a bunch of other ifaces, semingly related to the network bridge. When I stop the VM, it drops back to showing lo and vmbr0 and requires a reboot to get the network back.

Any ideas on whats going on? I've never used PM before, and a reinstall isn't ideal as the VM spent all night updating the OS and downloading games to see if they run. The plan is to move my workstation over to a fully virtualised environment and seperate things a bit as well as running a development server.

Edit: I just rebooted the host, removed the network adaptor from the VM and it's done the same. Dropped the physical interfaces and lost connectivity.

Curious Pineapple · May 1, 2020

After trying to resolve the issue, I've just decided to reinstall and write off the time already spent. At least now I can use AHCI mode instead of IDE, and this time the installer has correctly configured the network interface without me needing to set a static IP manually.

Jarsky · May 3, 2020

Sounds like a misconfigured bridge.

enp1s0 & enp2s0 should not have IP addressess assigned to them and shouldn't be assigned direct to VM's typically. They should be tied to vmbr0.

Not sure why it keeps dropping though without troubleshooting.

Curious Pineapple · May 3, 2020

I think just swapping the drive between machines was a bad idea. I've got it all working now and it's briliant. I setup Proxmox on an SSD, setup a VM and added my original physical drives to it, and it booted right up. Only issue was nVidia and drivers that refuse to load on a virtual machine, ended up having to convert Windows from MBR to GPT and using the EFI, but it runs fine.