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Checksum is the 16-bit one's complement of the one's complement sum of a
pseudo header of information from the IP header, the UDP header, and the
data, padded with zero octets at the end (if necessary) to make a
multiple of two octets.
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Checksum is the 16-bit one's complement of the one's complement sum of a
pseudo header of information from the IP header, the UDP header, and the
data, padded with zero octets at the end (if necessary) to make a
multiple of two octets.
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For Ethernet and other IEEE 802 protocols, the standard states that data is sent least significant bit first, while the FCS is sent most significant bit (bit 31) first.LSB MSB тоже может наоборот