>> Yeah the removal of the p2p topology was one of the reasons. It's
>> actually the fact that ics-openvpn doesn't really parse point-to-point
>> ifconfig that made me aware of this.
> 
> I wasn't aware of that, but since Arne is reading here, maybe he can
> comment on it.  It's possible that the Android VPN API just does not
> permit p2p mode, but wants a subnet.
> 
> Arne, any idea if /31 works on Android?

Yes. But Android is special here anyway. It always wants a subnet mask
but the mask can be also be 255.255.255.255. And you also don't have a
gateway address and Android also does not set a route to the tun
interface (On Android 4.4+). So basically you always operate in p2p mode
and emulate other modes by adding routes to the tun interface.

Arne

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