https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=14700
--- Comment #12 from Peter Wu <pe...@lekensteyn.nl> ---
The datagram tag is already used as ID to group fragments for reassembly, see
"fragment_add_check" in packet-6lowpan.c. The datagram size should be the same
for a given tag (unless it is reused), so it might not be more useful than the
datagram tag.
Using mesh originator/destination addresses (when available) seems like a good
idea. Whether to use it in addition or to replace the 802.15.4 addresses
remains an open question (which you can probably answer better than I do).
What I am not sure about, though, is why changing pinfo->dst/src would help
fixing your original issue. It is not used in the reassembly API
(epan/reassembly.c), so somehow it is indirectly having some influence (perhaps
through a "conversation" in the IP dissector?).
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