http://www.cnblogs.com/mail-ricklee/archive/2008/10/15/1311847.html

http://www.cnblogs.com/epjnpe/archive/2007/12/04/982731.html

http://www.cnblogs.com/alcoholwang/archive/2008/02/28/load_balance_scheme_dns.html

http://www.sudu.cn/info/html/edu/net/20071226/25865.htmlhttp://www.cnblogs.com/epjnpe/archive/2007/12