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Glue records are needed to prevent circular references.
Circular references exist where the name servers for a domain can't be resolved without resolving the domain they're responsible for.
To verify this, you can query the DNS server directly for the Net Scaler appliance record of the sub-domain, as shown in the following screen shot: To delegate a BIND for Global Server Load Balancing on a Net Scaler Appliance, complete the following procedure: Note: In this procedure, it is assumed that you have already created the zone file and appropriately modified the file for the use.
Also when configuring BIND, it is important to note that recursion needs to be ON. If not, zone will not work and BIND DNS server will not be able to reach out to Net Scaler for name resolution.
Depending on the availability and load, the Net Scaler appliance responds to the queries for the configured names with the best possible Global Server Load Balancing service IP address.
After completing the preceding procedure, the queries sent to the sub-domain of the DNS server either causes a recursive lookup to the Net Scaler appliances or are responded to with the Net Scaler records you have configured.
It defines the DNS protocol, a detailed specification of the data structures and data communication exchanges used in the DNS, as part of the Internet Protocol Suite.
You can verify the appropriate setup of the DNS delegation by ensuring the lookup is set to type NS.The Domain Name System delegates the responsibility of assigning domain names and mapping those names to Internet resources by designating authoritative name servers for each domain.Network administrators may delegate authority over sub-domains of their allocated name space to other name servers.With 100 of millions of hosts and billions of web pages it is an impossible task - it's also pretty daunting even with just a handful of hosts and resources.To solve this problem the concept of Name Servers was created in the mid 70's to enable certain attributes (properties) of a named resource to be maintained in a known location - the Name Server.