some link for network

http://www.yuanma.org/data/2007/0312/article_2407.htm

http://selab.whust.com/Display_Diary.aspx?DiaryID=49

http://www.docin.com/p-56484222.html

http://www.et.cyu.edu.tw/09ling/2010/fpt/c22.pdf

http://www.qqread.com/net-skill/d684124081.html

http://www.qqread.com/net-skill/x683124081.html

http://networking.itags.org/networking-tech/242408/

http://macintoshy.spaces.live.com/Blog/cns!F59FBCF296059B2C!588.entry

http://www.360doc.com/content/10/0731/23/2379862_42836957.shtml

http://nicelife.blog.hexun.com/49043506_d.html

http://www.cnblogs.com/jembai/archive/2008/08/11/1265151.html

tcp tutorial : http://www.ssfnet.org/Exchange/tcp/tcpTutorialNotes.html

http://www.net130.com/cms/Pub/network/network_protocal/2007_01_07_61640.htm