Route a smaller subnet over Wi-Fi for KDE Connect
For posterity, this is the help message that I posted on the SIPB Mattermost:
I'm trying to use KDE Connect on my laptop in my room, which has a bit of a complicated setup since it's both connected to Ethernet and Wi-Fi. My laptop is only able to connect to my phone via Wi-Fi so I ran nmcli connection modify "MIT SECURE" +ipv4.routes "10.0.0.0/9" to route all connections to the devices on MIT Wi-Fi over Wi-Fi instead of Ethernet which it uses by default. This has been working fine for the past two years but it broke sometime this summer. Now, with that routing rule, even when my laptop is unplugged from Ethernet and only using Wi-Fi, KDE Connect still fails to reach my phone, even though I'm still successfully able to run an HTTP server on my phone and connect to it on my computer. Also, that routing rule should just be a no-op when my laptop is connected to only Wi-Fi. I tried downgrading KDE Connect using the magic of NixOS but the downgraded version just segfaults so I can't conclude much from that.
Actually, the stranger thing is that KDE Connects works around 25% of the time, but it's inconsistent.
I might just give up and use KDE Connect over Bluetooth instead of Wi-Fi.