Because a new IP address is prioritized to the top with each query, clients aren't repeatedly routed to the same server. The initial release of Windows Server can't natively use the netmask ordering feature and the round robin feature at the same time.
If the netmask ordering feature is turned on, the answers are always provided to the clients in the same order. In Windows Server , this behavior changed to permit the use of both the subnet-based netmask ordering feature and the round robin feature. The use of both the netmask ordering feature and the round robin feature provides proximity awareness and load-balancing.
In many current network environments, it's uncommon to have a subnet mask that is native to the actual address. Therefore, netmask-ordering that is based on the native class of an IP address is unreliable in predicting whether a network is local. Windows Server bases proximity on Class C regardless of the native address class. For example, a company is assigned a It's unlikely that an 8-bit subnet mask will be used to define this subnet in their internal network.
Additionally, the company owns only part of the class A subnet. Because this range will likely be divided into class B or smaller networks, netmask ordering may not return results that are close to the client. This is true if the network configuration is different from the network configuration that is implied by the native class of address.
Because Windows Server bases proximity on Class C, close resources are more discoverable. Note that round robin only works on authoritative servers. Non-authoritative servers cache the order in which IP addresses were returned by the authoritative server and fulfill subsequent requests from the cache. Name checking: Load zone data on startup: I? Enable automatic scavenging of stale records. One of the obvious shortcomings of round robin is its unawareness of the status of load-balanced servers, so in essence it will go on issuing load-balanced IP addresses, even if one of the load-balanced nodes goes down or gets overwhelmed by incoming requests.
Another problem is evident on web servers that establish sessions, where round robin may forward requests to web servers that have no information about sessions previously established on other web servers in the pool. What do I get with a subscription?
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