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we did not apply the special case to store 0xFFFF (-0) in the checksum field when the checksum calculation returned zero. we survived this for v4 as RFC768 states: > If the computed checksum is zero, it is transmitted as > all ones (the equivalent in one's complement arithmetic). > > An all zero transmitted checksum value means that the > transmitter generated no checksum (for debuging or for > higher level protocols that don't care). for ipv6 however, the checksum is not optional and receivers would drop packets with a zero checksum. |
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