Install libnids1.21 by entering the following commands in the terminal:
sudo apt update sudo apt install libnids1.21
Description:
IP defragmentation TCP segment reassembly library
Libnids is a library that provides the functionality of one of the NIDS (Network Intrusion Detection System) components, namely E-component. Libnids code watches all local network traffic, cooks received datagrams a bit, and provides convenient information about them to the NIDS analyzing modules. Libnids performs assembly of TCP segments into TCP streams, IP defragmentation, and TCP port scan detection.
Homepage: http://libnids.sourceforge.net/
Version: 1.24-4
Section: universe/libs