Easiest solution is to ask your ISP admin if they have filtering to prevent such spoofing. Though of course, even if they say they did, that''s not absolute insurance.

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Original post by cbenoi1
On Windows, I honestly don''t know how that would be handled without incurring some very noticeable overhead (i.e. by filtering using a RAW socket).

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I guess you could use TCP/IP & UDP filtering, and just block any traffic inbound from 127.0.0.1 (or any other local host address). But depending on how winsocks handles loopbacks, this may cause some issues(but really really shouldnt).