content_image/664333.jpg content_image/664334.jpg content_image/664335.jpg content_image/664336.jpg
<img src='content_image/664333.jpg'>

To identify a connection between two nodes it is necessary to provide their node IDs in the [tcp] section of the configuration file as the values of NodeId1  and NodeId2 . These are the same unique Id values for each of these nodes as described in Section 23.3.3.7, “Defining SQL and Other API Nodes in an NDB Cluster” . 

• OverloadLimit 

<img src='content_image/664334.jpg'>

When more than this many unsent bytes are in the send buffer, the connection is considered overloaded. 

This parameter can be used to determine the amount of unsent data that must be present in the send buffer before the connection is considered overloaded. See Section 23.3.3.14, “Configuring NDB Cluster Send Buffer Parameters” , for more information. 

• PreferIPVersion 

<img src='content_image/664335.jpg'>

Determines the preference of DNS resolution for IP version 4 or version 6. Because the configuration retrieval mechanism employed by NDB Cluster requires that all connections use the same preference, this parameter should be set in the [tcp default]  of the config.ini  global configuration file. 

• PreSendChecksum 

<img src='content_image/664336.jpg'>

If this parameter and Checksum  are both enabled, perform pre-send checksum checks, and check all TCP signals between nodes for errors. Has no effect if Checksum  is not also enabled. 

