IP leak with Firefox/WebRTC alert: media.peerconnection.enabled + fix

[cubem...@gmail.com]

For those who prefer to keep their location private FYI - this leaks your local IP's even with a VPN. To test go to this page

https://diafygi.github.io/webrtc-ips/

To fix go to about:config in the firefox URL box, search for media.peerconnection.enabled and set to false. Less of a concern with Qubes, much more so in other OS's, but should be blocked regardless. Safari doesn't have this issue, and Chrome (of course) you can't prevent leaking.

[Tim W]

Have you confirmed you are also not leaking IP via DNS as well before this?   I would have thought ( not saying its correct) that if you were going thru a VPN this enabled would leak your LAN IP address unless you had a public IP directly attached to your network interface.  More just interested.  I disabled this when I first found out it was enabled by default at the first of the year i.e Jan '15. 

Reason I ask about the DNS is its a sore spot for me as I had lots of trouble in the past locking it down between configs and VPN providers ( not Qubes specific BTW) so I know it can be a PITA to get right sometimes.