n is either 1 (true) or 0 (false). The default value is 0.
IPv6 controls whether your instance is operating in an IPv6 (Internet Protocol Version 6) network, with IPv6 addresses. For more information, see the IPv6 Support section in the “Configuring InterSystems IRIS” chapter in System Administration Guide.
Changing This Parameter
On the Startup page of the Management Portal (System Administration > Configuration > Additional Settings > Startup), in the IPv6 row, select Edit. Select IPv6 to enable this setting.
Instead of using the Management Portal, you can change IPv6 in the Config.Startup class (as described in the class reference) or by editing the CPF in a text editor (as described in the Editing the Active CPF section of the “Introduction to the Configuration Parameter File” chapter in this book).