Services that use network address resources might require that start or stop steps be done in a certain order relative to the network address configuration. The following optional callback methods, PRENET_START and POSTNET_STOP, enable a resource type implementation to do special startup and shutdown actions before and after a related network address is configured or unconfigured.
PRENET_START - This optional method is called to do special startup actions before network addresses in the same resource group are configured.
POSTNET_STOP - This optional method is called to do special shutdown actions after network addresses in the same resource group are configured down.