May 2018
Beginner
230 pages
4h 49m
English
Ping sweep works on the ICMP ECHO request and the ICMP ECHO reply. Many users turn off their ICMP ECHO reply feature or use a firewall to block ICMP packets. In this situation, your ping sweep scanner might not work. In this case, you need a TCP scan. I hope you are familiar with the three-way handshake, as shown in the following diagram:

To establish the connection, the hosts perform a three-way handshake. The three steps in establishing a TCP connection are as follows:
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