On Mon, 6 Jun 2011 16:16:57 -0400 (EDT) [email protected] wrote: > was looking at Vidalia's Tor Network Map, and rather than the usual > 3 link chain, I saw a 4 link chain. > > Did they change something, is this an anomaly? What's going on with > this? I thought Tor was hard-coded with a 3 link chain?
This can happen when Tor ‘cannibalizes’ a normal three-hop circuit (most often, it has circuits pre-built to exit nodes that allow exiting to ports you have used recently, and you try to connect to an IP address and port that none of the pre-built circuits' exit nodes allow access to), or when Tor connects to an ‘exit enclave’ (a Tor relay running on a server you are trying to connect to). Tor also often builds four-hop circuits while connecting to hidden services. Robert Ransom
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