how to specify a source port?

[Dennis Jenkins]

Federico Donati wrote:
> Hi all,
>
>
> I'm in trouble with checking a remote service. I have to check if the
> service is alive and i do this by using the check_tcp plugin.
> Unfortunately, the remote service is not managed by me and it requires a
> specific source port, and you know that check_tcp doesn't support this
> feature.
>
> So, somebody had my problem? How to resolve? I've already wrote to
> devel-list, but i didn't get any answer.
> Before to begin scripting, i'd like to know if there is a ready-to-use
> solution.
>
> Any kind of help will be appreciated.
>   

If your Nagios server is running BSD or Linux then you can use the 
built-in firewall to transparently change the port.  Kind of like NAT, 
but just for the port (some vendors (Juniper) call this PAT).  I suppose 
that Solaris and Windows might have this ability too, but I'm not that 
familiar with their equivalent of iptables / ipfw.


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