check_dhcp

[Guy B. Purcell]

On Nov 18, 2005, at 05:42, Jamie Pratt wrote:

> I have an environment with 4 MS Active Directory DNS servers  
> running DHCP. The dhcp servers are "load-balanced" in two pairs,  
> via a cabletron smart-switch router upstream which hands off two  
> offers per dhcp request...
>
> So.. Herein lies my problem. Since the AD servers do not actually  
> hand off the addresses (the switch does), the checks on the ad  
> system IP's fail, even though two offers are recieved, it fails....

[...details of the failuer...]

> Obviously, if i monitor the 10.2.1.1 address with check_dhcp, it  
> works fine, but defeats the purpose since the ssr router/switch is  
> the parent of most of these devices, MS AD systems included... :-(
>
> So.. Any future option for specifying the oferring server, and the  
> actual requested server, or any workarounds available here? I dug  
> around extensively for a "workaround" or something but have found  
> nothing.. any ideas/thoughts appreciated...

For load-balanced services, I normally monitor the service on each  
host in the pool individually, with the results of those monitors  
monitored by the special "cluster monitor"; however, you have  
hardware interfering with that, so you can't do it.  Unless you can  
somehow program the SSR to return the DHCP replies with the source  
addresses of the AD servers, you'll just have to monitor it as if it  
were a single DHCP server.

-Guy




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