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Intrusion Detection Systems, Portsentry.

IDS.

IDS is acronym for 'Intrusion Detection System'.

IDS's can be compared to computer alarm systems.


Portsentry.

Portsentry is not large a program, which task is monitoring open and used ports in our system.

it can detect unauthorized transmission of packets on suspicious, normally not used for communication a port and notify admin.

it can also just after detecting suspicious activity cause block in transmission that could happen next if not blocked.


Source: [5].

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