Tor Leaking

Ringo Kamens 2600denver at
Wed Jun 14 11:42:37 UTC 2006

As long as you use the default configuration and set your browser to use a
HTTP proxy, then DNS leaks shouldn't be a problem. The problem occurs when
you tell programs to use tor as a socks proxy and they decide to resolve
their own DNS names. If you block DNS resolving with your firewall the
program might try to resolve the DNS name through tor. If you route a
program through freecap it shouldn't be a problem. DNS leaking was more of a
problem in the past and if tor is passed an IP address (which is a sign of a
DNS leak) it will warn you.

On 6/14/06, Simon Callow <simoncallow68 at> wrote:
> I came across a privacy blog that says even when you
> set up Tor correctly it still leaks sometimes. It says
> And you Thought you were Safe!—You've installed that
> proxy chain. You've shooed away the two Jays—those
> attractive, brightly coloured birds that prove just
> that little bit too inquisitive for comfort. You've
> done everything correctly—by the book. So you call up
> your favourite search engine, enter your favourite
> topic, and soon you're clicking away on one link after
> another, sure in the knowledge that Big Brother
> doesn't know what sites you're visiting. Right? …
> Wrong! Some of those clicks will be putting a smile on
> Big Brother's face. And no need to feel so smug, all
> you Tor users—yes, we mean you too!
> It's at They
> are not against Tor as they're running a campaign
> supporting it and they seem to know a lot about
> privacy.  I had a look through the archives and the
> Wiki and I can't find anything that would cause Tor to
> just leak sometimes.  If you've done it by the book
> then that would be with Privoxy so I thought there
> would be no DNS leakage.  If you have turned off Java
> and Javascript as they say they I thought you'd be
> okay apart from the sort of attack where someone looks
> at both ends of the line.  They seem to be saying that
> DNS leaks sometimes but not always.  But if Tor wasn't
> set up properly then it would leak all the time.  Am I
> missing something.
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