request MAC recognition

```
ability to recognise a network by the MAC address of an IP.

i.e.
I have a locked down network.  It has the same net/subnet as other networks i 
use.  The only 2 ways i can tell them apart are the MAC of the proxy server or 
if traffic moves with/without proxy settings.


```

Original issue reported on code.google.com by `Qua...@gmail.com` on 21 Dec 2014 at 5:22
