The screenshot below shows the packet capture of the TCP SYN Flood attack, where the client sends the SYN packets continuously to the server on port 80. The packet capture is viewed using CLI based tcpdump tool. The packet is identified as a SYN-ACK packet by looking at the packet listing field and also by looking at the packet details field, highlighted in red below. The same packet capture can be downloaded from the link below for educational learning and analysis purposes in the lab environment. TCP ACK Finally, we can see the client that initiated the TCP session sends an acklowledgement to complete the 3-way handshake. The sample capture of a valid TCP Three-way handshake with a http transaction can be downloaded here. Take a Windows Filtering Platform (WFP) capture to determine which rule or program is dropping the traffic.
The sample capture of the SYN Flood denial of service attack can be downloaded here. To do this, run the following command in a Command Prompt window: Run a scenario trace, and look for WFP drops in SMB traffic (on TCP port 445). PTK is unique between a client station and access point. Optionally, you could remove the anti-virus programs because they are not always WFP. To generate PTK, client device and access point need the following information. PTK PRF (PMK + Anonce + SNonce + Mac (AA)+ Mac (SA)) Anonce is a random number generated by an access point (authenticator), Snonce a random number generated by the client device (supplicant).
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