any way to specify source address for server?

[Marc Powell]

> -----Original Message-----
> From: nagios-users-admin at lists.sourceforge.net [mailto:nagios-users-
> admin at lists.sourceforge.net] On Behalf Of Paul Archer
> Sent: Tuesday, May 09, 2006 12:38 PM
> To: nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] any way to specify source address for server?
> 
> I'd like to give my Nagios server a virtual IP address, so that if we
want
> to migrate the monitoring service to another machine in the future,
it'll
> be easy (just setup the new machine and give it the same virtual IP).
> While nrpe can be configured to only listen on certain interfaces, I
can't
> find any way to make Nagios send only on certain interfaces. Right
now, it
> uses the primary interface only.
> So, is it possible to tell Nagios only to use a particular interface?
Or
> is this at least coming in a future release?

As with almost every application, this is controlled by the routing
tables of your Operating System. Unless you specify a more specific
route out a different interface for your destinations, the OS will
always route traffic out your default gateway interface, sourced from
that interface.

This question has come up before and though I am not authoritative on
plugin development (which you are really talking about), it is almost
certain that the plugins will continue to rely on the OS for proper
routing.

If you're restricting access on remote hosts by IP, (as we do), you can
static NAT your nagios host IP at a firewall/other device or move the IP
when you change hosts. 

--
Marc


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