Re: Nonlinear limits on the number or rate of NSURLConnections
Re: Nonlinear limits on the number or rate of NSURLConnections
- Subject: Re: Nonlinear limits on the number or rate of NSURLConnections
- From: Jens Alfke <email@hidden>
- Date: Wed, 26 Aug 2009 14:13:38 -0700
On Aug 26, 2009, at 1:54 PM, Jerry Krinock wrote:
Thanks, Hamish. I didn't know that much about P2P until this
morning, but I believe you're saying that an ISP would use the high
rate of connection requests to distinguish between "allowed"
streaming video from, say cnn.com and "bad" BitTorrent/P2P
connecting to many servers in a "swarm". That makes sense.
Actually, to me it sounds more like a virus scanning lots of random
hosts, looking for one that's vulnerable to some HTTP-based attack
(like any of the dozens that PHPBB or WordPress have been subject to
in the past.)
BitTorrent traffic tends to involve large data transfers in each
connection (that's kind of the point), not very small requests. And
the data doesn't smell anything like HTTP.
On the other hand, the traffic you describe also seems similar to an
RSS/Atom newsreader updating its feeds — it's also sending lots of
small requests to many hosts at once. (A newsreader won't usually
abort the connections, but it does send conditional GETs, which most
of the time return only headers in response.) If you use a news-
reader, can it successfully update?
—Jens _______________________________________________
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