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How does the TCP/IP stack handle UDP checksum errors?

Last updated on December 26, 2018

        <a href="https://tools.ietf.org/html/rfc2460#section-8.1" rel="nofollow noreferrer">RFC 2460, Internet Protocol, Version 6 (IPv6) Specification, Section 8.1 Upper-Layer Checksums</a>, states the UDP checksum is mandatory and any IPv6 receivers must discard UDP packets containing a zero checksum, whereas it is optional for IPv4.
Who drops it and at what level? Does the hardware discard it or does some layer in the stack discard it?

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