George is correct in what he’s said here. If this is a simple isolated network with one switch, two clients, and a fog server - then the FOG server just isn’t running DHCP as it should be. You can check if the service is running or not with service dhcpd status and you can try to start it with service dhcpd start on Ubuntu 14. Your configuration file will be at /etc/dhcpd/dhcpd.conf If you told the FOG installer to do DHCP, the fog installer would have built this file for you and configured DHCP too, and enabled it and started it as well. I can test that this is working properly on Ubuntu when I have some time. I can say that it works just fine with CentOS 7, I’ve not tried DHCP via FOG on the other major distributions in a few months but I don’t think any of that code has changed much.
J