If I try to set up an hotspot in GNOME, I get the following message:If you have a connection to the Internet other than wireless, you can use it to share your internet connection with others.Switching on the wireless hotspot will disconnect you from <network name>.It is not possible to access the internet through your wireless while the hotspot is active.What are the technical reasons why I can't set up an Hotspot and be connected to the Internet at the same time?
Hotspot and Internet access together  why not?
wifi;networkmanager;internet
Uses the same antenna.Currently most software doesn't allow to be in client and AP mode at the same time.Wireless is a half-duplex protocol, except for some really new bleeding edge stuff. The radio can only transmit or receive at one time, it cannot do both at the same time.Going with point 3, if any software was developed to allow both client and AP mode simultaneously the radio would first need to communicate like a client and then pass the data along as an AP. The latency would be undesirable, and the most likely cause that no one has made software to run both client and AP mode at the same time.