determine interface(s) used, their specs and crosstalk - OS specific

[kgersen]

The goal is to determine for an url which local network interface(s) is/are used to reach it and then get the specs of that(these) interface(s): Ethernet, WiFi, LTE, etc and the max speed and whatnot.

Also if available get the byte counters on the interface before and after the url transfer.

Ideally find (or build) a platform agnostic lib to do this.

see research/crosstalk_linux.sh for a demo.