Comparative Analysis of Active and Passive Mapping Techniques in an Internet-Based Local Area Network
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Network mapping technologies allow quick and easy discovery of computer systems throughout a network. Active mapping methods, such as using nmap, capitalize on the standard stimulus-response of network systems to probe target systems. In doing so, they create extra traffic on the network, both for the initial probe and for the target system's response. Passive mapping methods work opportunistically, listening for network traffic as it transits the system. As such, passive methods generate minimal network traffic overhead. Active methods are still standard methods for network information gather...
Network mapping technologies allow quick and easy discovery of computer systems throughout a network. Active mapping methods, such as using nmap, capitalize on the standard stimulus-response of network systems to probe target systems. In doing so, they create extra traffic on the network, both for the initial probe and for the target system's response. Passive mapping methods work opportunistically, listening for network traffic as it transits the system. As such, passive methods generate minimal network traffic overhead. Active methods are still standard methods for network information gathering; passive techniques are not normally used due to the possibility of missing important information as it passes by the sensor. Configuring the network for passive network mapping also involves more network management. This research explores the implementation of a prototype passive network mapping system, lanmap, designed for use within an Internet Protocol-based local area network. Network traffic is generated by a synthetic traffic generation suite using honeyd and syntraf, a custom Java program to interact with honeyd. lanmap is tested against nmap to compare the two techniques.
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