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

By David J. Marchette

In the autumn of 1999, i used to be requested to educate a path on machine intrusion detection for the dept of Mathematical Sciences of The Johns Hopkins collage. That path used to be the genesis of this ebook. I have been operating within the box for numerous years on the Naval floor struggle heart, in Dahlgren, Virginia, below the auspices of the SHADOW application, with a few investment via the place of work of Naval examine. In designing the category, i used to be involved either with giving an outline of the elemental difficulties in desktop protection, and with supplying details that used to be of curiosity to a division of mathematicians. hence, the point of interest of the path used to be to be extra on tools for modeling and detecting intrusions instead of one on find out how to safe one's computing device opposed to intrusions. the 1st job was once to discover a ebook from which to educate. i used to be acquainted with a number of books at the topic, yet they have been all at both a excessive point, focusing extra at the political and coverage elements of the matter, or have been written for defense analysts, with little to curiosity a mathematician. i needed to hide fabric that will attract the school individuals of the dept, a few of whom ended up sitting in at the path, in addition to supplying a few attention-grabbing difficulties for college kids. not one of the books out there on the time had an enough dialogue of mathematical concerns with regards to intrusion detection.

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The simplest usage is nslookup machine where "machine" is either a machine name or IP address. com.. ). In addition to the preceding usage, nslookup has an interactive mode. 9. MISCELLANEOUS UTILITIES 29 nslookup This will give you a prompt (probably">"). Now you can type machine names (or IP addresses) one at a time, and it will resolve each one. There are other commands available; type "help" at the prompt for a listing of the available commands. 3 whois The "whois" directories give information on the owner of a particular domain name or IP address.

There are a number of implementations of the ping utility, but I will discuss the most common (ICMP) implementation. The standard usage is ping host Several "echo request" ICMP packets are sent to the host. The host replies with "echo reply" (unless a firewall or other security measure denies this or the machine is not responding or nonexistent), and the time between packets is computed. This gives an estimate for the time it takes for packets to transit between the machines. Packets will be sent until the user kills the program (one can specify the number of 28 1.

Another strength of snort is the ability to add plug-ins. A plug-in is a program which extends the abilities of a piece of software. These are familiar to the users of Web browsers, where plug-ins allow the browser to expand the types of files it can process or adds functionality that is otherwise missing. In snort plug-ins add capabilities such as the collection of statistics, storing output in a database, or special visualization tools. This extensibility makes snort a very useful tool. 8 ifconfig The ifconfig utility is used to configure the network interfaces but can also provide information about them.

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