@fydel so it occurs to me that in my apartment, I can ping all my neighbors... nothing is stopping me from running my own dhcp and dns server...

you most likely have l3 to your neighbors, but not l2

@Fireduck that seems to be the case. I thought I was seeing l2 at first. :(

proxy arp madness?

yeah

if l2, scan for ipx and you know if you have a member of the cssa about

leaving this here in case someone has homebrew issues on macOS with clang 7 or later down the line with mojave https://pastebin.com/e2q7ignC