Make sure your Proxmox server is set up with a static IP address on the physical network interface. For the virtual network, ensure that it is set up correctly, and all VMs and LXC containers are attached to this network. Assign static IP addresses to all your servers and clients to avoid conflicts with DHCP. Reserve these IP addresses in your DHCP server configuration (pfSense) to prevent accidental IP allocation conflicts. Ensure that your LXC container (running Ubuntu Server) has the correct network configuration. Use a bridged network interface so that the container can get its IP address directly from the physical network. Double-check that the LXC container’s network settings are consistent with your Proxmox virtual network setup.