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Things look quiet here. But I've been doing a lot of blogging at
dan.langille.org because I prefer WordPress now.
Not all my posts there are FreeBSD related.
I am in the midst of migrating The FreeBSD Diary over to WordPress
(and you can read about that here).
Once the migration is completed, I'll move the FreeBSD posts into the
new FreeBSD Diary website.
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nmap - the port scanner
10 August 1998
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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? |
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Port scanner? What's a port scanner?
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| 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. |
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Which scanner?
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| 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. |
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The install
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| 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. |
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