It looks like there are two functions that print Rx
acknowledgement packets in print-rx.c: ack_print(), and
rx_ack_print(). The latter was added by kenh in rev
1.8, and then assar added his version, ack_print(), in
1.14, overriding the previous one. ack_print() seems
less featureful than rx_ack_print(), so the attached
patch removes ack_print() and lets rx_ack_print() print
ack packets instead.
It also adds another rx ack packet type name.
aforementioned patch
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Administrators of the "tcpdump" SourceForge project have superseded this tracker item (formerly artifact 672892, now patch 16) with issue 173 of the "tcpdump" GitHub project.