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rameshr_132303's avatar
rameshr_132303
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Aug 12, 2015

DNS Server forwarding requests to GTMs at two sites

Hi All,   First off, apologies if this sounds more like a DNS related query.   I'm currently putting in place a solution for a customer. We have two Datacenters - London and Bristol and there's...
jonnyquest_2564's avatar
jonnyquest_2564
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Mar 30, 2016

LDNS here acts as a resolver, so it doesn't forward the user traffic to anywhere, rather it helps user to resolver the FQDN.

 

Both GTMs' records will be responded to the LDNS by the upper level domain, like this:

 

lb1.redirect.group.com. 212.162.7.99

 

lb2.redirect.group.com. 69.74.209.171

 

And now (I'm not sure about this, sorry), the LDNS will try to contact lb1 and lb2 simultaneously (or the LDNS will just make contact with lb1 first, not sure), and both GTMs will reply back, say the LDNS got the reply from lb2 first, and it will choose to communicate with lb2 hereafter.

 

lb2 will communicate with lb1 to decide which IP to send back to LDNS depends on the configurations. E.g., the availability of the site, GEO location, etc.

 

Hope this helps.