Oh, interesting! Which ping have you got? Mine comes from the iputils-ping Debian package, which the man page confirms it's part of some broader iputils set of

Oh, interesting! Which ping have you got? Mine comes from the iputils-ping Debian package, which the man page confirms it's part of some broader iputils set of tools. I see there is also inetutils-ping which provides the same /bin/ping and /bin/ping6 commands, is that perhaps the one you've got? For anyone wanting to replicate this "provides" query on Debian, I use `apt-file search /bin/ping` to list what packages have a file with that name -- this will also match `/usr/bin/ping6` (both prefixes and suffixes will match) but that was fine in this case. (If you just do `apt search ping` or something, you get a huge list of any package mentioning the word ping, which may be what you want when searching for something more broadly; and if you use `apt search /bin/ping` it comes up empty because it doesn't have file path data.) Edit: now that I had looked up which utility it is, I figured I'd check the "is documentation enough" on how it finds which interface to use. It looks to me like it is `getaddrinfo` that decides it: https://github.com/iputils/iputils/blob/master/ping/ping.c#L648-L681 https://github.com/iputils/iputils/blob/master/ping/ping.c#L...