Content filtration firewall system (8) - Appendix for Content Filtering Firewall System Based on Linux

xiaoxiao2021-03-06  41

Appendix A Frequently Detailed Port

0 usually used to analyze the operating system. This method can work because "0" in some systems is invalid port, when you try to use a usual closed port

Different results will occur when connecting it. A typical scan: Use the IP address of 0.0.0.0 to set the ACK bit and broadcast in Ethernet layer.

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