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- IN_PACKET_CHECKSUM is used by network cards that can
compute complete packet checksums to pass that information to
higher-level protocols. That tag contains the 2-byte checksum of the
complete packet. A protocol such as TCP needs to ``subtract'' the
non-relevant parts of the packet from the checksum. This type of
support was added for some of the older Intel cards, that did not
compute protocol-specific checksums as newer hardware does.
Angelos D. Keromytis
7/7/2003