Library /sys$common/syshlp/tcpip$ucp_help.hlb SET, CONFIGURATION, INTERFACE, Qualifiers, /C_BROADCAST_MASK  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /C_BROADCAST_MASK=IP_address

    Optional.

    Sets the cluster broadcast mask to receive all broadcast
    messages.

    The software calculates the default by the following methods:

    o  Using the network number

    o  Setting all bits in the host number field to 1