>There already is a direct interface to IPoIB through the '\\.\ibat' device. >There is an IOCTL defined to allow getting the GID for a given remote MAC >address (IOCTL_IBAT_MAC_TO_GID). You can see the IOCTL definition in >'inc\iba\ib_at_ioctl.h'. Do you know offhand how to get from the IP address to the MAC address? - Sean