I have a situations where we had a child DC go down and has to be rebuilt from scratch It was configured by the previous Network Admin a long time ago and there is zero info on how it was configured previously so it was lost with the system crash.
So we have 2003dc and 2008dc let's say in the parent.com domain in the 192.168.0.x scope. The child domain was in child.parent.com domain in the 192.170.0.x scope. Nested in the parent.com DNS forward lookup zone I have a zone for child.parent.com with records for the child DC child.parent.com and I am able to ping the child DC. I cannot ping either 2003dc.parent.com or 2008dc.parent.com. The ip addresses of the two parent.com dc are in the fowarders for the child.parent.com domain but I still cannot ping or contact them either by ip or hostname. I've tried adding a secondary zone and a stub zone but it's unable to validate the host/ip address. Hopefully what was clear, any help would be appreciated.