Default routes in AP+Client network modes

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Thanks. I've tried this in several configurations, including RPI3: AP/Client (it uses the onboard wifi for both), and RPI3: AP+Client (which is intended for an external USB wifi adapter). I get the same default routes, which causes my normal routing via Internet to not work. BTW, I get internet access via my phone's hotspot. I tried using USB tethering but apparently my Mexican Telcel plan doesn't allow it (I know, weird, right?).

Anyway, everything works fine if I eliminate default routing via 10.10.10.1 - wlan1.

I guess I could modify the IF-UP script so that the wlan1 default route goes away when wlan0 is connected.