The transport checks the flags reported by the operating system for each network interface upon initialization. An interface that is not reported as UP will not be used. This property allows the same check to be extended to the IFF_RUNNING flag implemented by some operating systems. The RUNNING flag is defined to mean that "all resources are allocated," and may be off if there is no link detected, e.g., the network cable is unplugged.

Two values are allowed:

• 0: Do not check the RUNNING flag when enumerating interfaces, just make sure the interface is UP.

• 1: Check the flag when enumerating interfaces, and ignore those that are not reported as RUNNING. This can be used on some operating systems to cause the transport to ignore interfaces that are enabled but not connected to the network.

[default] 1 (i.e., check RUNNING flag)