Libnids is a library that provides the function of one of the NIDS (Network Intrusion Detection System) components, namely E-component. The libnids code watches all local network traffic, processes received datagrams a bit, and provides convenient information on them to analyzing modules. Libnids performs: a) assembly of TCP segments into TCP streams b) IP defragmentation c) TCP port scan detection WWW: http://libnids.sf.net