Re: [Openvpn-users] Network monitoring [was Re: Answering on the same interface where the request came from]

[Martijn Lievaart <m@xxxxxxx>]

Charles Duffy wrote:

> On Thu, 24 Feb 2005 23:16:54 +0100, Martijn Lievaart wrote:
>
>  
>
> > > Eh? Can't Nagios support DNS? Script up your OpenVPN instances to
> > > register both reverse and forward DNS for connecting clients.
> > >      
> > It's not an DNS issue. Nagios does not use DNS, how can it work reliably
> > if it did?
> >    
>
> You want to monitor whether the host with CN foo is up, but you don't know
> which OpenVPN instance that host will be connected to. You configure your
> OpenVPN instances to register foo.vpn.company.com in DNS whenever such a
> system connects, and have Nagios query the services not of 1.2.3.4 but
> rather of foo.vpn.company.com, which the DNS server will always redirect
> to the right place. What's so inherently unreliable on unworkable about
> this? It's literally what I do (I'm using homegrown network monitoring
> software rather than Nagios).
>
>  

You are right, I misunderstood. Normally you don't want your nagios 
checked host to be resolved by DNS, if some local DNS breaks, it does 
not neccessaraly mean the host/service is broken. In this case however, 
using DNS is part of checking the service.

M4


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