Proxmox 8 will not connect to network

[scott90210]

Good morning everyone. I am completely new to Proxmox and have read dozens of threads and am still having issues. I installed Proxmox 8 on a new SSD in a mini-PC (MULTIPLE times) but I am not able to connect to the UI or even have my router recognize that the PC is connected to the network.

I have verified that the NIC is working properly as I have swapped out the PROXMOX SSD with another SSD that has Windows 11 installed; Windows 11 successfully connected to the network with no issues. I have set the DHCP settings in my router to have the NIC MAC set to a static IP, which worked fine with the Windows SSD.

I am including a pic of the ip address, ip r, ip a and cat /etc/network/interfaces commands from the proxmox pc directly. The 'enp2s0' is the hardwire NIC (MAC 68-1D...) I selected in the setup process, whereas the 'wlp3s0' is the onboard wireless, which was NOT selected in the setup process.
Thank you to anyone that can help with this!

 

[itNGO]

Link is down: NO-CARRIER.... vmbr0 state DOWN....

 

[bbgeek17]

enp2s0 interface, that is part of your bridge and where the IP address is assigned, shows "NO CARRIER" , meaning the NIC did not detect a live cable.
Was your windows box using wireless connection by chance? Is the cable actually plugged in?
Wireless NICs are not encouraged with PVE.

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Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

 

[scott90210]

Thank you both. Yes, I can confirm that Windows used the NIC when it connected. Confirmed in both windows and the router with the NIC MAC connected. Even now, the NIC has flashing lights and I have changed the cable and the port on the router. I can even see the router port flashing, confirming that data is being transmitted through the port.
I had thought originally that the subnet was incorrect as my router has 255.255.255.0 programmed, however it appears that the setup process did choose that subnet.

 

[itNGO]

Did you install PVE 7.4 or 8.0? Maybe the Kernel does not like your NIC?

 

[bbgeek17]

The "CARRIER" detection is layer1 of the OSI model, way before subnets get involved. I'd agree with @itNGO that its possibly a compatibility issue between OS/Kernel and your NIC.
Try to boot off USB with vanilla live Ubuntu and see if that option detects the wire.

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Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

 

[scott90210]

Did you install PVE 7.4 or 8.0? Maybe the Kernel does not like you NIC?

I installed the latest v8 of Proxmox. I tried to reinstall 7.4 after the first several failed attempts at v8, but it would not install so I kept v8. In fact, I reinstalled as recently as this morning EST.

As for the NIC not being recognized by the OS…that is a very interesting hypothesis. I will try the Ubuntu option and see what happens.

 

[scott90210]

Well, the NIC not being compatible seems to be the issue. I attempted to install Ubuntu and the only option to connect to the internet was wireless, despite the NIC being hardwired. Thanks for the help! Back to square one now...lol