Hello,
If you are trying to send/receive raw packets through Ethernet, the best way to accomplish it would be to use a third party library, like Wsock32.lib, which is a protocol-independent interface for network programming. Our TCP functions are high level, and does not let you do such a low level manipulation.
BTW, if you want to use SDK functions in CVI, please check out the KnowledgeBase:
http://ae.natinst.com/operations/ae/public.nsf/fca7838c4500dc10862567a100753500/4d03093f2079abdd86256969006e9ecc?OpenDocument
Mika Fukuchi
Application Engineer
National Instruments