This page https://community.spiceworks.com/topic/1870844-wifi-connection-not-used-for-internet leads me to the following stab in the dark:
Is your DHCP server configured to provide a gateway IP address to clients, and, if so, would it solve the problem if you configure it NOT to do that? -- Next meeting: Bournemouth, Tuesday, 2018-03-06 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ New thread: mailto:dorset@mailman.lug.org.uk / CHECK IF YOU'RE REPLYING Reporting bugs well: http://goo.gl/4Xue / TO THE LIST OR THE AUTHOR