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Introduction to Network IDS - Types, Placement, Formats

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Michael Boman
Michael Boman

This document introduces network intrusion detection systems (NIDS). It discusses how to physically connect a NIDS using a network tap, switch SPAN port, or hub. It also covers different types of NIDS like pattern matching and anomaly detection. The document explains false positives, false negatives, and interoperability challenges between vendors. It concludes with a question and answer section and recommends calculating the severity of network events using the SANS rating formula.

Technology
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Introduction to Network IDS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What we will cover: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Why Network Intrusion Detection ? ,[object Object],[object Object],[object Object],[object Object]
Think about this before installing a Network IDS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
How to connect your Network IDS ,[object Object],[object Object],[object Object],[object Object]
Using a network TAP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],( TAP = Test Administrative Port)
Inside a Network TAP Device A Network IDS Device B TX TX RX RX RX RX
Can anyone spot the problem? ,[object Object]
Did you figure it out? ,[object Object],[object Object]
Using a switch SPAN port ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Using a HUB ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Where to connect your NIDS
Different types of NIDS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
False Positives / False Negatives Alert generated Alert not generated Malicious traffic Non-malicious traffic
False Positives / False Negatives Explained ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Detector capability Property Result in it's absence Reliability Sensitivity The level of certainty provided by detector when receive warning of possible event The capability detector has for extensive and complex analysis in locating possible attacks False Positives False Negatives
Network IDS Interoperability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
IDMEF / IDXP ,[object Object],[object Object],[object Object],[object Object],[object Object]
SDEE ,[object Object],[object Object],[object Object]
SDEE Quote ,[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],SANS Severity Ratings Criticality + Lethality System Countermeasures + Network Countermeasures ) ( ( ) -
SANS Severity Ratings (cont'd) ,[object Object],[object Object],[object Object],[object Object]
What have we learned? ,[object Object],[object Object],[object Object],[object Object],[object Object]
Questions? ,[object Object]
Recommended reading material ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Introduction to Network IDS - Types, Placement, Formats

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  • 7. Inside a Network TAP Device A Network IDS Device B TX TX RX RX RX RX
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  • 12. Where to connect your NIDS
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  • 14. False Positives / False Negatives Alert generated Alert not generated Malicious traffic Non-malicious traffic
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  • 16. Detector capability Property Result in it's absence Reliability Sensitivity The level of certainty provided by detector when receive warning of possible event The capability detector has for extensive and complex analysis in locating possible attacks False Positives False Negatives
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