Security utility for Linux server by Olivoy

Author:Olivoy
Language: eng
Format: azw3
Published: 2017-10-15T04:00:00+00:00

This is somewhat the same principle as above. Knowing that a proper TCP connection requires three packets with three different flags, one sees right away the finesse of this rule that can work packet by packet. For more information on TCP flags, see Wikipedia.

Note that this basic rule is not very effective, it is a basic protection. Part 2 will go further in blocking port scans.

Banned an IP

If you find a suspicious IP address in the logs or other, you can banish it easily at the firewall via the command:

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