网络安全工具

killads

扫描器---nmap
Usage: nmap [Scan Type(s)] [Options] <host or net list>

-sS TCP SYN stealth port scan (default if privileged (root))
-sT TCP connect() port scan (default for unprivileged users)
-sU UDP port scan
-sP ping scan (Find any reachable machines)
-P0 Don't ping hosts
-O Use TCP/IP fingerprinting to guess remote operating system
-v Verbose.
-o <logfile> Output scan logs to <logfile>
-p <range> ports to scan.  Example range: 1-1024,1080,6666,31337

例子：# nmap -sS -p 21,23,53,80 -O -v www.yourserver.com
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密码破解---John the Ripper
Usage: john-386 [OPTIONS] [PASSWORD-FILES]

--wordlist=FILE --stdin    wordlist mode, read words from FILE or stdin
--restore[=NAME]           restore an interrupted session [called NAME]
--show                     show cracked passwords
--test                     perform a benchmark

解密过程中可以使用Ctrl+C键中止，下次可以从断点继续，所有已破解的密码保存在john.pot文件中，进度文件名默认为restore。
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嗅探器---tcpdump

tcpdump快速入门手册:http://tcpdump.anheng.com.cn/news/22/591.html
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nmap参考指南：http://insecure.org/nmap/man/zh/index.html
John the Ripper文档:http://www.openwall.com/john/doc/
tcpdump手册：http://www.tcpdump.org/tcpdump_man.html