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ServicePointManager.EnableDnsRoundRobin Property

Gets or sets a value that indicates whether a Domain Name Service (DNS) resolution rotates among the applicable Internet Protocol (IP) addresses.

Namespace: System.Net
Assembly: System (in system.dll)

public static bool EnableDnsRoundRobin { get; set; }
/** @property */
public static boolean get_EnableDnsRoundRobin ()

/** @property */
public static void set_EnableDnsRoundRobin (boolean value)

public static function get EnableDnsRoundRobin () : boolean

public static function set EnableDnsRoundRobin (value : boolean)

Not applicable.

Property Value

false if a DNS resolution always returns the first IP address for a particular host; otherwise true. The default is false.

When more than one IP address is associated with a host name, a DNS resolution normally returns only the first IP address. If you set this property to true, then subsequent DNS resolutions will cycle through all available IP addresses for a particular host. This option is useful when a service uses DNS as a load balancing mechanism between servers or server clusters.

The following code example sets this property.

ServicePointManager.UseNagleAlgorithm = true;
ServicePointManager.Expect100Continue = true;
ServicePointManager.CheckCertificateRevocationList = true;
ServicePointManager.DefaultConnectionLimit = ServicePointManager.DefaultPersistentConnectionLimit;
ServicePointManager.EnableDnsRoundRobin = true;
ServicePointManager.DnsRefreshTimeout = 4*60*1000; // 4 minutes

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0
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