DNS Delegation

When you create a delegation in NIOS, make sure that the “Name” of the delegated name server is the correct FQDN of the name server(s) you are delegating to (in addition to the IP addresses you set). If NIOS is authoritative for teh FQDN's zone, then a “system” record is automatically created for the FQDN that cannot be deleted. If NIOS is recursive, then NIOS will resolve the delegation for recurring queries and, for non-recursive queries (+norecurse in DIG) it will return FQDN but not IP.

If you change the FQDN of a delegation server, the existing system record will be removed.

If NIOS is not authoritative for the FQDN of the delegation server, it will try and resolve the FQDN to get the IP (even though the delegation config already has the IP) and recurse the answer for the client.