Deep Packet Inspection Bypass

[xaviel]

Some Canadian ISPs(Rogers) have rolled out new traffic shaping software (As of Feb 1st 2007), using deep packet inspection, effectively throttling down torrent speeds to a crawl (5kps, when i used to get 700kpbs).

Tuoto, a chinese torrent & eMule client, has managed to bypass this deep packet inspection, giving back regular speeds for torrent downloads.

It would be a great addition to the virtually perfect uTorrent.

[Switeck]

A proprietary solution is not a permanent one.

It probably uses UDP packets as well, which numerous people have trouble already with µTorrent's DHT UDP packets.

Being able to deeply encrypt/decrypt something so ISPs cannot do "Deep Packet Inspection" means a big hit on the old CPU and probably ram as well.

[xaviel]

I wonder at what layer level they do their Deep Packet inspection? So VPN-ing to a public VPN server corrects the throttling problem to a certain extend, I get 400kbs. But i used to get 700kps so...

[Switeck]

Some ISPs are no doubt throttling the encrypted BitTorrent traffic based on behavior even if they cannot read the packets. So when they see lots of random ips all connecting to a single incoming port, especially if they see one NOT using encryption, (even one doing so by mistake!) then they know that port is BitTorrent's incoming listening port...and they throttle to death that 1 port.

They may also be throttling non-HTTP/FTP/email ports by default...which will be basically impossible to defeat. The only possible solution would be for BitTorrent traffic to go to a "standard" port and duplicate "standard" traffic from that port.