A line of code can read online, however, is to realize his mistakes too much, custom IP, icmp packets of what confused about, is according to the copy on the net, can receive a message, the resolution will not, will only build a socket send a word of what,
Really too food, class set has been cool, I think back to the winter vacation to learn, try to achieve a variety of scanning, further learn
Bosses recommended basic book or give a learning path,