I created a new bridge but it's not up after boot

Jan 12, 2015
I created a bridge (vmbr3) yesterday and rebooted my proxmox hypervisor but vmbr3 is not coming up at boot and the VM using this bridge is failing to start automatically. I can `ifup vmbr3` and start the VM by hand, but I'd like to know what's not working correctly.

My /etc/network/interfaces is here
auto vmbr3
iface vmbr3 inet static
   bridge_ports eth3
   bridge_stp off
   bridge_fd 0

I also noticed this hidden file in /etc/network/. Could this be the issue?
# dir /etc/network
-rw-r--r--   1 root root    0 Apr 17  2017 .pve-interfaces.lock


The Proxmox community has been around for many years and offers help and support for Proxmox VE and Proxmox Mail Gateway. We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get your own in 60 seconds.

Buy now!