[SOLVED] Adding NIC - Network stops working

[ZooKeeper]

So, I had to fresh install proxmox due to lack of zfs coding. and here I am with fresh install.

I have motherboard ethernet which I use to access proxmox from web. I have dual port NIC which I am planning to use for pfsense but before I setup, I decided to use other single port NIC I had lying around. I can use for something else in pfsense. So I plugged in that NIC and started proxmox server, internet stopped working. I shutdown and took out NIC and internet start working.

I don't have any VM running at moment.

How do I make it work?

 

[harry700]

Did you check the output of ip a, to see if the NIC's state was UP?

 

[ZooKeeper]

this is what look like after adding.

Here is link as pic was too big to upload here - https://imgur.com/DceUjIW

 

[harry700]

It seems that all the interfaces are down, but no obvious set up problems from the output. Try ifup -a, and see if that fixes the problem. If not, could you post the output of cat /etc/network/interfaces?

 

[ZooKeeper]

I already tried ifup -a not working. Here is interface file look like:

https://imgur.com/3IvYuHD

 

[harry700]

Is there anything interesting in the verbose output (ifup -v vmbr0)?
Could you also post the output of dmesg | grep enp4s0 and the NIC's entry from the output of the command lspci -v?

 

[ZooKeeper]

I really appreciate your help. Here is pic of all command I ran. I am sorry I can't give proper output as I can't ssh into without network. I have to take pic and upload.

https://imgur.com/6iRapRh

 

[ZooKeeper]

so I figured out it. So I removed NIC and try to see what is MAC address is for the one where it work and after NIC, it was changing from enp4s0 to enp5s0 - so I had to change it in

/etc/network/interfaces

easy solution then I thought