[tor-talk] Firefox DNS leak?

Mike Perry mikeperry at torproject.org
Fri Nov 15 05:21:05 UTC 2013

> ubuntu 12.0.4 lts updated
> ff 25.0 (ubuntu, not tbb)
> set proxy all to tor via socks5
> set dns proxy socks
> surf to stackexchange.com
> see udp dns leak via tcpdump
> any confirmation / fixes ?

There is a known DNS leak in WebSockets. Does it happen if you set
'network.websocket.enabled' to false in about:config?

Another possibility is WebRTC, which can leak more than just DNS.
http://net.ipcalf.com/ will use WebRTC mechanisms to probe your IP for
testing purposes.

I believe you can disable WebRTC by setting media.peerconnection.enabled
to false, but there may be other prefs involved too.

Mike Perry
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