August 30, 20187 yr Wanted to share this as I spent some time fixing it this evening, my linux skills are not the best so it took a while. I have a plex server running on Debian 9 in a VM on Unraid 6.5.3. I stopped the VM, edited it and added an extra CPU core. Once started there was no network connection any more when I ran ifconfig (other than the local loopback) via VNC. lspci - this showed the inteface card was there, chaning the type as other threads recommended didn't make a difference. ip address show - this gave me the interface name (that took me the longest to track down) I then edited /etc/network/interfaces and changed enp1s0 to match the new interface name in the 3 places shown below: # The primary network interface allow-hotplug enp1s0 iface enp1s0 inet dhcp # This is an autoconfigured IPv6 interface iface enp1s0 inet6 auto After running the following (name to match the new interface name) I got networking back. ifconfig enp1s0 up I rebooted and everything was still fine. Hope this of use to people a similar issue :)
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