TCP restrictions in Microsoft's latest Windows XP service pack—SP2—could slowdown P2P download
activity according to a post on Tech-Recipes. It seems that by design SP2 limits the number of simultaneous incomplete
outbound TCP connection attempts.
Once the rate is reached, subsequent connection attempts are placed in a queue eventually to be resolved at a fixed rate. Rumors are already around the internet that this slows down programs that open multiple TCP connections at once. Port scanners are a good example of this. Some P2P might be effect as well in theory.
Anyone has noticed change in speeds? Please report in the comments below.
PS: We have a long discussion here at the Peer-to-Peer Weblog on how to improve P2P download speed by changing setting in your router.








1. There is a work around this and can be changed. The links can be found on this blog post. http://www.geekswithblogs.net/tpatel/archive/2004/07/26/8849.aspx
Posted at 4:29AM on Dec 19th 2005 by Tejas Patel