Notification dependencies

[steve at nexusuk.org]

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I am setting up monitoring for a large VPN network - we have a central 
colocation and a number of VPNs from there to branch offices.  At the 
moment, I am monitoring:

1. the ISP-side gateway of each branch office
2. the real IP of the VPN server for each branch office
3. the internal RFC1918 IP address of the VPN server at each branch 
office.

>From this monitoring I can tell if there is a fault with a VPN, and whhere 
that fault is (i.e. I can tell if the ISP is having problems or if it's 
actually a problem with the VPN server).

The hosts have parents set up so they become unreachable in the right 
order (ISP's gateway is the parent of the VPN server which is the parent 
of the internal VPN address).

If the ISP goes down then I don't get alerts for the actual VPN going down 
- - this is how I want it, and infact I'm not reponsible for the ISP 
problems, so that alert goes somewhere else - I don't need to know 
anything about it.

The problem is that after the ISP has had an outage, it takes a few 
minutes for the VPN to come back up and during that time, the ISP's 
gateway and the VPN server are up but the VPN's internal address is down.  
After a few minutes the VPN all comes up absolutely fine.  But When the 
ISP recovers it means I get 2 alerts - one telling me the VPN is down and 
another 5 minutes later telling me it's up.

So is there any way for me to delay the "VPN is down" alert once the ISP 
recovers so that it'll check 10 minutes after the ISP recovers and only 
warn me if the VPN is still down then?

(Sorry for the really long email :)

- -- 

 - Steve         Jabber: firefury at sucs.org     Web: http://www.nexusuk.org/

     Servatis a periculum, servatis a maleficum - Whisper, Evanescence

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