I just find a relation between the bad checksum and lenth:

I have seen:
bad checksum: 5a1c , when Len is 120
bad checksum: 5f58 , when Len is 1460
bad checksum: 5e1c , when Len is 1144
bad checksum: 5a28 , when Len is 132

This seams to mean that:

checksum= 0x59A4 + Len

but why on earth do I have this bug?

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