Download Computer Intrusion Detection and Network Monitoring: A by David J. Marchette PDF

By David J. Marchette

In the autumn of 1999, i used to be requested to coach a direction on computing device intrusion detection for the dep. of Mathematical Sciences of The Johns Hopkins collage. That path used to be the genesis of this booklet. I were operating within the box for a number of years on the Naval floor war middle, in Dahlgren, Virginia, lower than the auspices of the SHADOW software, with a few investment through the workplace of Naval examine. In designing the category, i used to be involved either with giving an summary of the fundamental difficulties in computing device safeguard, and with supplying info that was once of curiosity to a division of mathematicians. hence, the point of interest of the direction used to be to be extra on tools for modeling and detecting intrusions instead of one on the right way to safe one's desktop opposed to intrusions. the 1st job used to be to discover a e-book from which to coach. i used to be acquainted with numerous books at the topic, yet they have been all at both a excessive point, focusing extra at the political and coverage features of the matter, or have been written for defense analysts, with little to curiosity a mathematician. i wished to hide fabric that might entice the college participants of the dept, a few of whom ended up sitting in at the path, in addition to supplying a few fascinating difficulties for college students. not one of the books out there on the time had an sufficient dialogue of mathematical concerns concerning intrusion detection.

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5 An example of the output from "lsof -i," listing all the open Internet files. 9. MISCELLANEOUS UTILITIES 41 • -0 Inhibit the conversion of network numbers to host names. This conversion can take quite a bit of time, so it is a good idea to suppress it for most applications. • -0 I -s Toggle between showing the file size and the file offset. Only one of these flags may be used. • -P Like the "-n" option, this suppresses the conversion of port numbers to port names. • +I-r [t] Put lsof in repeat mode.

IfTCP is so much more reliable than UDP, why does UDP exist at all? Why not use TCP exclusively? The main reason is the overhead involved in ensuring the reliability. For applications where reliability is not that critical, UDP can be faster, and require fewer packets, than TCP. For example, I was involved with a project to automatically find objects in a video (for example, tanks in the desert). This was implemented on a cluster of nine Linux machines, where the processing was Initiator Receiver Fig.

The idea behind traceroute is that if you know the original value of the TTL field, you then know how many routers the packet passed through before the final router. The key to making this really useful is the fact that the "time exceeded" ICMP packet contains the IP address of the final router as the source address. Traceroute works by sending packets with increasing TTL values and reporting the IP addresses of the routers. The TTL increases from an initial value of 1 until the destination machine responds, indicating that the full route has been traversed.

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