Edge gateway 3001, Ubuntu Core 16 - Internet not working on wlan interface

Hello All,

I am using Dell Edge gateway 3001 with Ubuntu Core 16.

My device is going to be connected to a local network via its ethernet(eth0) interface(no internet on this interface).

It will also be connected to the Internet via the wlan0 interface.

Both the connections are working correctly separately. However, as soon as I connect them both simultaneously, my device cannot access the Internet(wlan0 interface), though interface eth0 is working correctly in this case.

How can I ensure that both the connections work simultaneously.

Thanks.