Moving Proxmox to a second NIC

I play around with Proxmox on my Intel NUC from time to time. The hardware has a bug with the LAN port, so I bought a USB Ethernet adapter as a workaround.

So far so good, but how do you get Proxmox to switch over to the new adapter?

Look for the name of your new interface: ip link show.
Look for anything that hasn’t been there before. In my case, the adapter got named ‘enx6c1ff72307f6’.
Open up the network interfaces config:
```
vi /etc/network/interfaces
```
Make sure you have a config line for your new interface in there:
```
iface enx6c1ff72307f6 inet manual
```
I already found that in there, so I assume Proxmox added that automatically.

Look for your vmbr0 config. It’s along the lines of iface vmbr0 inet and contains an indented command bridge-ports ... that will show another interface:

# I have a static IP assigned. This might differ from your setup if you are
# using DHCP
iface vmbr0 inet static
     address 192.168.1.242/24
     gateway 192.168.1.1
     # Here's the old interface:
     bridge-ports enp89s0
     bridge-stp off
     bridge-fd 0

Replace the existing interface enp89s0 with your new one: bridge-ports enx6c1ff72307f6
Save, exit and reboot the server

That worked for me nicely.