http://blog.csdn.net/zgrjkflmkyc/article/details/39207209 http://www.splaybow.com/post/c-linux-wangka-hunza-moshi.html http://www.pdbuchan.com/rawsock/rawsock.html http://www.tuicool.com/articles/UBnQfm3
modify and forward data
send data from pcap file to net