DNS Server forwarding requests to GTMs at two sites

Hi Cyril,

Thanks i understand that. But my question is, the Local DNS server in WAN, how would it forward the user traffic to either the London or Bristol GTM? Once the traffic reaches the GTM, the GTM can then return the IP address of either London or Bristol's LTM for the local server.

But if the London DC fails, how would the local DNS route the request to the Bristol GTM? Would the user keep waiting for a DNS time out and send the request to the local DNS server again and again till the local DNS server forwards the traffic to Bristol? Or would the local DNS server after forwarding the traffic to London, wait for a response from London's GTM and when it doesnt receive a reply forward the traffic to the Bristol GTM after a timeout?

Thanks