[piggg]

I remember in the 2000s a large-ish Telco network in the US was running ospf on an IX. A few of us on IRC did the what if? And one of us brought up the adjacency and it worked.

Same network also had all their network links in MRTG public too with no auth - if you only knew the hostname/URL you could see it all (which their staff would sometimes drop in Noc communication when linking a graph and you attempted to go there to poke around).