Scanning Your Network
Source: O'Reilly / OnLamp - Posted by Nick DeClario   
Intrusion Detection This document covers examining ICMP packets, IP packets revealed, Capturing TCP Packets, TCP Protocol Layers, and Understanding Filesystem Inodes on a FreeBSD system. "In the next few articles, I'd like to demonstrate putting some of this knowledge together in order to . . . This document covers examining ICMP packets, IP packets revealed, Capturing TCP Packets, TCP Protocol Layers, and Understanding Filesystem Inodes on a FreeBSD system. "In the next few articles, I'd like to demonstrate putting some of this knowledge together in order to increase the security of your FreeBSD system.

The ports collection includes the nmap utility, which is a valuable tool for determining which services your FreeBSD system is advertising to other TCP/IP hosts. However, like most useful utilities, it should only be used to test the computers in your own network. You should also be aware that it is very common for unscrupulous users to use this utility to scan for insecure hosts on the Internet. It is preferable for you to find out first what they'll be able to discover about your system so you can take measures to ensure they'll only be able to see what you want them to see.

Read this full article at O'Reilly / OnLamp

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