** PROBLEM FIXED**
After the Android 13 install my phone was configured to use IPV4 with Bouygues. That seems to have stopped connection sharing working. I changed to IPV6 and now I can share the connection (via wifi or USB, or I suppose Bluetooth).
Parmameters / Network / SIM profiles / Bouygues Telecom / Acess point names
There was a “Bouygues” which was set top IPV4 and a “Bouygues Telecom” which was set to IPV6 and has a bunch more stuff under “APN type”.
Changing the APN to “Bouygues Telecom” fixed the sharing problem.
My network is Bouygues Telecom (France).
My FP4 is running Android 13.
I find that when I try to tether my laptop to my Fairphone 4 the connection between the phone and the laptop works, but if the phone is connected to the internet via the cellular signal (4G or 5G) I can’t access the internet from the laptop.
All DNS requests come back REFUSED, any ping or connection requests get a network unreachable or host unreachable.
If I connect the phone to the internet vi WIFI the connection works, but that is pretty useless as I could use the WIFI directly from the laptop.
Anyone seen anything like this?