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Why does Neighbor Discovery Protocol have to monitor upper-layer protocols?

Last updated on December 26, 2018

        While reading the <a href="" rel="nofollow noreferrer">RFC</a> of NDP I wondered, why it is necessary to monitor upper layer traffic in order to know if a neighbor is reachable, e.g. a TCP ACK.
I do get the IPv6 packet anyway, so I know it's reachable without having to bother about TCP.

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