[SOLVED] Network issue - Help

[curiouscase]

I will start by mentioning a few things. I have no experience with networking, servers, etc. but just started doing a few things as a hobby. Also, I have no clue on how to use Linux/Debian as I have always used Windows.
Reading things on Reddit pushed me to use an old HP desktop I had as a Proxmox VE machine. I successfully set up a few different VMs and also started using dockers on one of them. Everything was working well.
This morning I started setting up NetAlertX using a docker. It was up but the eth0 was not displaying anything so based on what I read online I enabled a passthrough for PCI ethernet port for the VM on which docker was running. I rebooted my Proxmox machine and I was not able to get the proxmox web interface back up. It showed "This site can’t be reached" I went back to my PC and connected a monitor to it to see if there was any issue with booting. The system is booting fine but it seems it is not connecting to the internet. I searched solutions and I saw someone mentioned to check if internet was enabled using systemctl is-enabled networking. I tried that and it was showing enabled. I rebooted my system and then as the system just booted I tried connecting to the proxmox interface page using the browser. For a brief second, I was greeted by the page saying that it was unsafe to proceed yada yada but when I proceeded it again went to show "This site can’t be reached".

I did try the networking interface details and they do look fine:


I also read some threads to check the network using commands like ip a and nmap. I am attaching the results here though I do not know how to interpret them.



I also generated a journal.txt file using journalctl -b > journal.txt but as I do not much about these terminal commands, I do not know how to copy that file from my proxmox system to a USB to post here.

Something tells me it's a minor issue that should be fixed easily. Please help me fix it.

 

[sw-omit]

Looking at the screenshot, it looks like the device it used to connect to the network with is gone (but used to be there, given the skipped order-number in the ip a command).
Is this VM/Container that you set up passthrough to set up as auto-start?
Cause if so, you might have just set it up to pass-through your entire ethernet-device, which you WERE using to connect to your proxmox-server to.
If that is the case, first try using "nano /etc/pve/qemu-server/<VM-number>.conf" to open the config with nano and disabling the onboot option by setting it to a 0 and then rebooting the server again.
if you don't remember what VM-number it was, try using "qm list", if you can't edit the file, try running "qm stop <VMID>" to stop/kill the VM (you could also try running this first and seeing if the network comes back to you, but I kind of doubt it)

EDIT: Also, in case that wasn't clear during your investigation: If you pass-through a device, it is no longer usable for Proxmox itself or any other VM's / Devices, like you unplugged it from your system and then plugged it "directly" into the VM itself.

 

[curiouscase]

Looking at the screenshot, it looks like the device it used to connect to the network with is gone (but used to be there, given the skipped order-number in the ip a command).
Is this VM/Container that you set up passthrough to set up as auto-start?
Cause if so, you might have just set it up to pass-through your entire ethernet-device, which you WERE using to connect to your proxmox-server to.
If that is the case, first try using "nano /etc/pve/qemu-server/<VM-number>.conf" to open the config with nano and disabling the onboot option by setting it to a 0 and then rebooting the server again.
if you don't remember what VM-number it was, try using "qm list", if you can't edit the file, try running "qm stop <VMID>" to stop/kill the VM (you could also try running this first and seeing if the network comes back to you, but I kind of doubt it)

EDIT: Also, in case that wasn't clear during your investigation: If you pass-through a device, it is no longer usable for Proxmox itself or any other VM's / Devices, like you unplugged it from your system and then plugged it "directly" into the VM itself.

Thanks! I came here to post an update.SO last night I thought I would start from scratch and reinstall. When I put in my USB I saw an option with "Advanced Option" and I went ahead and found "Rescue Boot" option. Tried that and it fixed my issue. I did lose 4 of my 6 VMs though as they were not booting, but those were all my experimental VMs. Luckily the 2 Dietpi's that survived were the ones I was most concerned about.