> -----Original Message----- > From: p2p-hackers-boun...@lists.zooko.com > [mailto:p2p-hackers-boun...@lists.zooko.com] On Behalf Of > Roberto Roverso > Sent: January 24, 2011 1:04 AM > To: p2p-hackers@lists.zooko.com > Subject: [p2p-hackers] NAT traversal state of the art > > I'm the author of the paper mentioned in this thread. > > I read the patent application and, however the idea of NAT > type discovery is present and common to our paper (as to > others: the STUN RFC above all), the patent describes just > few types (6) of NAT behavior. In our paper, we define as > many as (27).
And yet you mention in paper that only 50% of combinations actually occur in practice :) I arrived at my classification working backwards compared to you. I was sitting and sifting through the NAT discovery logs, trying to group results into a set of classes. After few iterations in a course of several months, I had five classes, two of which had two additional (boolean) parameters, and the traversal logic was built around this set. I suspect that if the impossible 50% is eliminated from the table and adjacent entries are collapsed, it might end up being the same set of classes. > On top of that, the paper outlines how to carry > out hole punching in each specific combination of NAT types > (NAT type A against NAT type B). Although many details are > omitted in the document due to space constraints, the > description is probably enough for people to start implement > state of the art NAT traversal logic in their p2p > applications. Results from our test network show that the > connection establishment success rate is very high using this > model (~ 90%). Can I ask how wide spread was your client base? When I first launched Hamachi it was getting over 97% of p2p connectivity, which frankly was way way more than I ever hoped for. But then the app started to see adoption outside of North America and the rate started dropping. There was a clear effect of (funny enough) Italy and few Asian countries on an average traversal rate. I wonder if you have noticed anything similar. Alex _______________________________________________ p2p-hackers mailing list p2p-hackers@lists.zooko.com http://lists.zooko.com/mailman/listinfo/p2p-hackers
