Connecting a wired interface breaks internet access via wireless in Windows 10

Question

[EDIT]

After a clean install on my desktop the issue was resolved. I now have all the applications I previously had and all traffic is still routed correctly, so I don't think any app was interfering with the connection.

All in all, the issue was resolved by reinstalling the OS, but I couldn't pinpoint what caused the problem in the first place.

[\EDIT]

On my desktop running Windows 10, I have two network interfaces; a wireless USB adapter and wired onboard ethernet.

Through the wireless I connect to my ISP's router with a DHCP that serves the 192.168.1.1/24 subnet. The wired interface connects to a router that routes inside a private network utilising the 10.0.0.0 subnet and has a DHCP that serves the 10.x.x.1/24 subnet (due to uniquely identifiable addressing in the private network the actual IPs are deducted).

When only connected to the wireless interface, I have access to the internet. A few seconds after I connect to the wired interface (still being connected to the wire) I lose connection to the Internet.

I have two persistent routes on the routing table. First one being:

0.0.0.0 mask 0.0.0.0 192.168.1.1 1

and the second one being:

10.0.0.0 mask 255.0.0.0 10.x.x.x 1

Answer 1

You need to make sure that each route has it's weight set correctly. Even though you have routes set manually, both DHCP probably is assigning a default route. If the weights are not set, then the OS uses the last successfully connected NIC as the highest priority for default routes, which is the 10.x network.