Setup Details :
In our environment there are two domains namely "a.com" & "b.com", both have tree root trust relationship established. there are about 8 domain controllers in total (a.com =2, b.com =6).
All the domain controllers are DNS servers and active directory is integrated into DNS.
Our primary DNS servers are BIND 9 - Linux DNS servers (ie in our client machines the linux dns server is set as the default DNS server)
1. Whenever we try to issue nslookup command in our client machines we are able to resolve a.com & b.com but we are not able to resolve the client machines using netbios name.
2. Whenever a new workstation is added into domain, Dynamic DNS entries for the workstation are not being updated regularly in the windows DC/DNS server(ie the workstations are added to active directory users and computers container but the dns entry is not updated properly ,we have more than 2500 computers in domain but only 1500 dns entries are available in the dns servers)