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Microsoft SQL Server 2008 High Availability by Hemantgiri S. Goswami

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Public and Private Network

In a clustering, each cluster node or every node that is a candidate for being a cluster node should have two Network Interface Cards (NICs) as a base requirement — one card can be used to configure the Public Network and second can be used to configure the Private Network.

  • Public Network: In a clustering environment, a network that is exposed to the public, that is, client systems to connect to is called the Public Network.
  • Private Network: A network that is used to connect two or more cluster nodes is known as the Private Network, also known as the Heartbeat.

    SQL Server uses this Heartbeat network for health detection between two or more nodes, especially in a single-node failover cluster. Consider a situation where we ...

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