NMAP - A Stealth Port Scanner--reference

From this,we can deduce that 10.0.0.4 is a Linux system (in fact,the one I’m typing this tutorial on!) running a 2.4 to 2.6 kernel (Actually,Slackware Linux 10.2 on a 2.6.19.9 kernel) with open ports 21/tcp,22/tcp,631/tcp and 6000/tcp. All but 6000 have version information listed. The scan found the IPID sequence to be all zeros,which makes it useless for idle scanning,and the TCP Sequence prediction as random positive integers. The -v option is needed to get Nmap to print the IPID information out!

（编辑：ASP站长）

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