nmap - the port scanner

This has to be the easiest port I've ever installed!  Or is it just that I'm getting to know how to do it?
Port scanner?  What's a port scanner?
A port scanner doesn't check for software.  Don't confuse this with a FreeBSD port.
A port scanner checks the [service] ports on a host to see what services the host is willing to provide.  For example, SMTP, HTTP, etc.  It is a common method to find out what can be exploited on that host.  Using a port scanner is a good way to find out is turned on/off for a particular host.  You can also use it to help verify that your firewall restrictions are what you think they are.
Which scanner?
I chose to install nmap as found in the
FreeBSD Security ports
.  Don't forget the
nmap homepage
.
The software can be downloaded from  
ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/ports/security/nmap.tar
.
The install
Well, I followed the instructions found in the
FreeBSD handbook
for
compiling ports from the internet
.  And it ran.  First time.
To get you started, try issuing the following command:
nmap -v localhost
That should show you all the ports available on your machine.


本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/4206/showart_523811.html

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