ifup — interface not configured
I was tinkering with Proxmox with an eventual goal of creating a new private subnet and prototyping some respective containers. I configured a new vmbr2 interface bridged to eth2.
I opened a terminal window and remotely logged into the Proxmox server. I tested the new interface with
ifup. I was greeted with the following message:
interface vmbr2 not configured
Wait a minute. I just configured the interface.
After some futile web searching, I walked away from the problem. The project did not need immediate attention.
The next day I had the usual proverbial light bulb moment.
While the error message is a tad cryptic, the message made sense after realizing I had not yet connected any Ethernet cable. No cable means no link, which means “not configured.”
After connecting a cable, the
ifdown commands worked as expected.