Got an interesting problem this morning. Someone connected together
by mistake two network wall connectors (some people don't like a
dangling connector). Those connectors are going to the same switch so
it's like you connected two ports of the switch together. Following
that, both our servers began to show IP conflicts with their own
manual-set IP addresses and MAC. We work a lot to find out where the
fault was but when we saw this cable connected to the two
wall-connectors, that explained everything of the problem, problem that
vanished immediately after we disconnected the cable. But why?