Lost connectivity after passthrough network interface

[maxymo]

I am new to Proxmox, have been using it for few weeks. The problem is that the web UI is not reachable, when using command line I see the network interface eno1 has an IP butI can't ping other devices in the network neither I can ping Proxmox machine from other devices.

I suspect what heppened, but no idea how to fix it without installing everything from scratch so I see it as an opportunity for learn from my mistake.

I recently installed latest version of Proxmox, created a VM and all working fine.

I created a second VM and this time I passthrough a network interface a PCI express in Hardware tab. In the list of PCI express there were 4 network interfaces (my server has 4 interfaces) but I wasn't sure which interface Proxmox was already using (I know it was the first physical interface) so I selected the second one in the list. I was still seeing a warning message when passing through about the IOMMU not enabled (so I did some research and enabled it modifying /etc/default/grub and modify line (GRUB_CMD_LINE_LINUX_DEFAULT="quiet intel_iommu=on") after doing update-grub and restarted the machine, the problem appears.

I suspect I selected the network interface to passthrough that Proxmox was already using. I manage to delete the VM that has the passthrough network interface through the command line using "qm destroy vmid" but even after restarting the machine I still don't have any connectivity.

Any idea what I can do to get connectivity again?

Attached what I have in /etc/network/interfaces and the output of ip a

 

[onepamopa]

Try going into
/etc/pve/qemu-server

Find the VM ID you added passthrough to, edit the .cfg file and remove the line with the passed NIC. You can also backup all the .cfg's to /root/ before doing any changes.

Thenr reboot, see if that helps.

 

[maxymo]

Thanks,

Try going into
/etc/pve/qemu-server

Find the VM ID you added passthrough to, edit the .cfg file and remove the line with the passed NIC. You can also backup all the .cfg's to /root/ before doing any changes.

Thenr reboot, see if that helps.

Thanks, I was able to get connectivity again but unfortunately after trying more times to passthrough NIC and HBA, I noticed my CPU will not support safely remapping interrupts so will not be able to use Proxmox for the intended use (Have Truenass in a VM).