Description

This is rather a question. Maybe there is a good reason for this behavior.

When pinging and duplicates arrive, the riot shell ping6 command just says

12 bytes from fe80::xxx: id=84 seq=1 hop limit=64 time = 0.280 ms
dropping additional response packet (probably caused by duplicates)

IPutils ping does it like this:

64 bytes from fe80::yyy%wlp3s0: icmp_seq=1 ttl=64 time=0.051 ms
64 bytes from fe80::zzz%wlp3s0: icmp_seq=1 ttl=64 time=166 ms (DUP!)

I wonder why you chose to do it like this. My primary reason to ask is that I use ping ff02::1 etc for debugging the network, for which the latter output is way more useable. Also, in general, when you have duplicates, I suppose you'd want to know where they are from. (Plus, it is quite arbitrary which of the packets are "hidden" by not displaying their information.)

Steps to reproduce the issue

Set up a node in a way that there's at least two other hosts listening on the same network.
Run ping6 ff02::1

Versions

linux
native gcc: gcc (GCC) 8.1.1 20180531
arm-none-eabi-gcc: arm-none-eabi-gcc (Arch Repository) 8.1.0