http://blog.chinaunix.net/uid-22312037-id-3575121.html
http://www.centos.bz/2012/08/tcp-establish-close/
http://blog.csdn.net/whuslei/article/details/6667471
http://course.cug.edu.cn/computernet/ch_8/ch_8_4.htm
http://blog.chinaunix.net/uid-22312037-id-3575121.html
http://www.centos.bz/2012/08/tcp-establish-close/
http://blog.csdn.net/whuslei/article/details/6667471
http://course.cug.edu.cn/computernet/ch_8/ch_8_4.htm