Subject: Bug in notes...

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The notes erroneously said the "between test" should
test:
    (rpsock->lstack <= hdr->ack < rpsock->nxtsnd)

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They should have said:
    (rpsock->lstack <= hdr->ack <= rpsock->nxtsnd)

When the ack for the LAST unacked packet arrives, it
will be the case that hdr->ack == rpsock->nxtsnd

When rpsock->lstack == hdr->ack, then the ack is
a duplicate,  but duplicates can carry window updates
and information regarding packet loss.