bind nagios to a fix ip

[Andreas Ericsson]

Fa. Schramm e.K. - Deutschland wrote:
> Hi all,
> 
> I am running an nagios daemon with serveral checks. My server machine 
> which contains the nagios process, has 5 ip's collective.
> 
> My problem is that nagios uses one of the 5 ip's, but not a fix ip. I 
> want to tell nagios to use one fix ip. In other daemons i can tell the 
> programm to bind an ip to it.
> 
> In nagios i didn't found this option.
> 

That's because Nagios isn't a networking daemon. It just sits on a 
server and runs other programs (plugins) to do the actual checking. The 
plugins leave to the kernel (that handles the routing table) to decide 
which interface to send traffic through.

> Is there a way to fix this problem?
> 

Short answer; No.

Long answer; It's possible but extremely cumbersome and the necessary 
changes to the plugins requires a substantial amount of C-coding 
knowledge as well as a complete insight into how IP networks work.

Since the plugins initiate the connection you'd have to make all the 
plugins use raw sockets (all of them need to be setsuid for this to 
work). That way they can set the outgoing IP by themselves. This is 
almost always a very bad idea, since you might end up sending packets 
that doesn't have a return route to send the responses through unless 
each network has a default route that is interconnected with all the 
other gateways (and all the networks know of each other). If you don't 
know what I'm talking about, see the short answer above.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Lead Developer


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