Windows 10 Data cannot go through cellular when Wi-Fi connected.

[DaochenShi]

Hi, I'm a Surface Pro with LTE user. I want to use both cellular and Wi-Fi simultaneously. But I cannot. I found in "View you network properties", cellular and Wi-Fi both got the IP address, but cellular "Connectivity(IPv4/IPv6): disconnected" while Wi-Fi is connected.


My network:

Wi-Fi: IPv4 only (10.1.2.3/24)

cellular: IPv4 + IPv6 (10.5.6.7/24, 2408:9:8:7:6:5:4:3/64)

cellular ON cellular OFF
Wi-Fi ON
everything goes through Wi-Fi,

even I manually add route to cellular.

I cannot ping/access any IPv6 site.

go through Wi-Fi as desired
Wi-Fi OFF go through cellular as desired, IPv6 is usable no network as desired


What I expected:

when connected to both Wi-Fi and cellular, visiting IPv4 sites through Wi-Fi, and visiting IPv6 sites fallback to cellular due to Wi-Fi doesn't have address.



Route(only keeps several):

IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 10.1.2.1 10.1.2.3 35
0.0.0.0 0.0.0.0 10.5.6.1 10.5.6.7 311
===========================================================================
Persistent Routes:
None
IPv6 Route Table
===========================================================================
Active Routes:
If Metric Network Destination Gateway
14 311 ::/0 2408:9:8:7:6:5:4:3
14 311 ::/0 fe80::6:5:4:3
Persistent Routes:
None





PS: Turn "Let Windows manage this connection" in cellular tab ON or OFF does not change the result.

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