libutp - µTorrent's new open µTP protocol

[skinvista]

http://github.com/bittorrent/libutp
http://blog.bittorrent.com/2010/05/21/%C2%B5tp-open-source-implementation

BitTorrent, Inc. famously catered to ISP's with the inclusion of a new network congestion aware uTorrent 3.0 ("self throttled").

Although the µTP "alternative to TCP BitTorrent" was widely met with preemptive skepticism,
the availability of its open c++ source as a ready-made library certainly bears looking at,
and could possibly provide useful code, if not outright adoption.

Or perhaps simply other issues to deal with as uTorrent 3+ proliferates.

[ailurophobe]

It might be a good idea to keep up with BitTorrent for compatibility reasons. And the congestion data could then be used to throttle other networks as well. But what we really want is something that works even if we are not using BitTorrent. I guess UDP based transport protocol for G2 would do. You can extract this info from TCP connections, but I have no idea if the Windows TCP/IP stack gives access to it. You might have to implement your own stack on top of raw sockets and then make Shareaza use that. Or write a packet filter that snoops on the traffic and extracts the info. That would have the advantage of being able to react to users other internet use instantly and always working regardless of what protocols you use.

[raspopov]

Using UDP as transport protocol is a very very very stupid idea. uTCP was massively blocked by many internet providers and turned off by many end-users to keep network hardware alive (because of too high PPS).

[diztrancer]

I moved to new appartment, where ISP blocks BitTorrent. So i use utorrent 2.1 and have 10Mbit downloads using only µTP protocol
Also µTP protocol solve many problems with hanged routers/modems caused by full NAT tables and other things

[raspopov]

uTP doing like protocol obfuscation so it may work temporary until ISP will not block BitTorrent again.

[diztrancer]

99% of ISP don't have any hardware/software to analize and block UDP traffic

[kaffeemonster]

*sigh*
They have the hardware, only none wrote a filter snippet to drop into their Force10. It will come...

And UDP is a bad idea. Trust me.
It may work well some time, but it will miserible fail at others.
Do you guess a cheap CPE router with overflowing TCP-Nat tables will survice massive UDP banging? It will even be worse, because UDP NAT is more complicated. And there are more "blackhole" problems with UDP...

Greetings
Jan

[diztrancer]

uTP solves all problem with home routes/modem, ISP can't block BT downloads, uTP is not so traffic agressive like BT on TCP - when use all available traffic u still able to run other P2P, messanging, use VoIP and browse web without slowdowns.

[raspopov]

Home routers can't support such packet rate either...

[diztrancer]

That's why when uTP was introduced all problems with hanging routers and unreliable web surfung are gone ?
uTP is present, live with it

[raspopov]

Its not true.

[diztrancer]

If you live in parallel universe - maybe.
I live in one universe with millions of uTorrent and other uTP compatible clients.