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On an Linux based system I created a WLAN Hotspot. I want to provide a single webpage via a webserver on this system. When I connect my Android devices to it they expect to get internet over this connection. But since the Linux host is offline the Android devices are able to see only the webpage and can't reach the internet any longer. I don't want the connected Smartphones to lose their normal connectivity.

Is it technically possible (for example by using any special WLAN settings or Hotspot configuration) to tell Android devices anyhow to use the WLAN connection only for accessing the single hosted webpage and to use their own mobile Internet (cell net) for any other internet access?

This question implies the question if it is possible to use mobile internet via cell network while beeing connected to a WLAN network on Android devices.

The Linux system currently is a Ubuntu Desktop machine and will be a Raspbian (Debian) on a Pi later on.

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  • AFAIK, mobile data and WLAN cannot be simultaneously connected - except for a few (Samsung?) devices with what they call Download Booster or some such. It pools active connections into one connection? I suppose it's a hardware limitation in other devices and requires special modem/radio tech. It's not at the level of hotspot settings :P
    – Tamoghna Chowdhury
    May 18, 2016 at 16:38

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The solution was to let the Android device create a tethering Hotspot and make the PC/Pi connect to it instead. Then the Android device is able to connected to the Webserver on the PC/Pi while still beeing able to talk to the internet. Additionally the PC/Pi is able, too.

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