FR: Warn users who connect via WiFi

[h0uz3]

WiFi can be laggy, therefore we need a way to recognize users that connect via WiFi and notify them to use wired Ethernet.

[Ryuno-Ki]

Will the speed be comparable? If so, you could measure the time needed to fetch a (sufficient large) resource in order to guess the connection. Web Apps have no way to query it AFAIK.

[h0uz3]

Speed is not the issue, reliability in some environments (read: 33C3) is. NodeJS is able to determine a connection's source address, hence find out where it comes from. As long as WiFi and Wired Network has different IP ranges (which is likely), this can be distinguished.