Re: [libvirt-users] Can't get cable connection working on virtual router machine

I'm pretty new to KVM and have a KVM CentOS 7.1 hypervisor running a few VMs. I'm moving all my VMs from an ESXi host as I want to use KVM in future. Most of my VMs are working except for one which is running a Sophos UTM router (Sophos UTM is similar to products like pfSense <https://www.pfsense.org/>;, Smoothwall <http://www.smoothwall.org/> etc). The host has 3 physical NICs which are configured on the Sophos VM as: 1) LAN (fixed IP) 2) DMZ (fixed IP) 3) WAN (which is directly plugged into a cable modem for the internet connection and is configured DHCP). I have imported the settings from the "old" Sophos machine so I know the configuration of the new one is identical to the old one. I have even tried configuring the NICs to have the same MAC addresses as the old one. The problem is that no matter what I try I cannot get the WAN NIC to get an internet link up and running with my cable modem. I have re-installed the VM countless times, turned off the modem and VM, done a factory reset of the modem, and, as I mentioned, ensured the MAC addresses are the same. Nothing I try has been successful.