Mac mini: Wi-Fi not prioritizing over Ethernet

Are you intentionally mixing private and public IP blocks?

How stable (and how fast) is the Wi-Fi?

Any VPN apps involved anywhere here, even if the VPNs are purportedly disabled?

Neo Network Utility (free) might help identify where the traffic is going.

PS: In network discussions, MAC and Mac are very different.

PPS: macOS 26.3 is current.

It's because it's the default setting of macOS. If you don't want to use WiFi rather than Ethernet, just not connect Ethernet cable to your Mac.

levy80 wrote:

Thanks for your reply, I need to connect both wifi and ethernet, wifi port connect to internet, and ethernet port used for intranet network.

Macs make rotten routers.

This’ll give you a start, though it’s dated:

• https://apple.stackexchange.com/questions/323741/how-to-use-mac-as-a-full-router-with-dhcp-dns-port-fowarding-etc

Mistakes here can be nasty too, as the Mac is more exposed than usual.

I’d hook the internet into the same LAN, and not try to use the Mac as a router.