Checking if a Port is Open

[Carroll, Jim P [Contractor]]

One solution would be to have a host that you have access to which is out
there in the 'outside world'.  This host would grant you, say, ssh access to
it.  You could install the check_tcp plugin on that host, and kick it off
from Nagios using check_by_ssh.  To wit:

Nagios --> check_by_ssh --> check_tcp --> port 25 of Nagios host

Food for thought.

jc

> -----Original Message-----
> From: Jake Colman [mailto:colman at ppllc.com]
> Sent: Thursday, October 31, 2002 5:00 PM
> To: nagios-users at lists.sourceforge.net
> Subject: Re: [Nagios-users] Checking if a Port is Open
> 
> 
> >>>>> "SK" == Sean Knox <sean.knox at sbcglobal.net> writes:
> 
>     SK> To check if a port is accessible from the outside 
> world, just telnet
>     SK> to the port. (i.e. telnet host 25)
> 
> I run nagios on the same server that is running sendmail.  
> The port is open
> on my internal LAN so nagios will always be successful in 
> monitoring and
> connecting to the sendmail server.  My concern is with being 
> able to monitor
> that sendmail can be reached via port 25 (or that any server 
> can be reached
> via any arbitrary port) from the outside world.
> 
> Is there a way to have nagios on my internal somehow run a 
> check into port 25
> but via the outside world?
> 
> -- 
> Jake Colman                     
> 
> Principia Partners LLC                  Phone: (201) 209-2467
> Harborside Financial Center               Fax: (201) 946-0320
> 902 Plaza Two                          E-mail: colman at ppllc.com
> Jersey City, NJ 07311                  www.principiapartners.com
> 
> 
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