We recently switched our setup to use 184.108.40.206 as our main DNS. We have a somewhat atypical DNS setup and we noticed that requests to sub3.sub2.sub1.oursite.com through 220.127.116.11 get routed to us as sub1.oursite.com (discarding anything before sub1). At the same time, 18.104.22.168 and most other DNS services do forward the entire request.
e.g: dig sub3.sub2.sub1.oursite.com @22.214.171.124 results in sub1.oursite.com request on our internal DNS e.g: dig sub3.sub2.sub1.oursite.com @126.96.36.199 results in sub3.sub2.sub1.oursite.com request on our internal DNS
Would you be able to point me to some resource as to why this is happening with 188.8.131.52 and how that can be mitigated?