ProxCP Admin - Manage Private IP Pool
From ProxCP Documentation
Private IP Pool Overview
ADMIN > Manage Private IP Pool
On this page, you can view, add, and delete private IPv4 pools for each Proxmox node. When a user requests to enable private networking on their VPS, they will be assigned a single IP from this private IP pool to be used for private networking.
This feature can be disabled if it is not supported.
Note: ProxCP assumes the private interface on every Proxmox node is named "vmbr1". ProxCP also assumes the public interface on every Proxmox node is named "vmbr0" (default).