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sysop_182859
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Apr 05, 2016

iQuery over Internet to determine Internet reachability/circuit availability

Hello, we've been trying to determine the best way to provide failover in the event of an Internet failure at a datacenter. We want to answer DNS requests with GTM for our hosted services when available (load-balanced, already working), and only one datacenter if the other one is offline. The latter I was able to make work with monitors, but have since learned iQuery is the proper methodology. Both sites have firewalls on the perimeter that are currently not allowing that traffic. I believe adding the external address and the translated address to the datacenter server page (address list) in GTM, and allowing that traffic will accomplish what I'm looking for, but I'm not sure. If I understand it correctly, iQuery will query the other datacenter via the external IP address, thus checking for Internet connectivity.

 

Any help is appreciated!! Thanks.