Monitoring Open Ports

[Justin Pryzby]

On Tue, Sep 29, 2009 at 02:51:07PM -0500, Matt Baer wrote:
> Is there a way that Nagios can monitor open ports, even if there
> isn't anything listening on the destination? I'd like to monitor my
> open ports on my firewall JUST to make sure they're open. I would
> just specify the port with the normal Nagios command and point it at
> my public IP address, but obviously, the check will fail unless
> something is listening on the other end. Basically I want to port
> scan specific ports. Any ideas? 
Can you use check_tcp for this?  Otherwise I would write a wrapper
around nmap:

 ! nmap -oG - -p 22 localhost |cut -sd/ -f2 |grep -Fxvw open

Justin

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