In this video we go over bonding 4 network adapters into one on a brand new Proxmox installation.

First backup your network config prior to making these changes.

1. Login into shell on proxmox.
2. Backup your network file using the following command.
 cp /etc/network/interfaces /etc/network/interfaces.bak

When creating your bond review each of the options at the link below. https://pve.proxmox.com/wiki/Network_Configuration