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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 Value

Type: System.Boolean
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


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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