> "It turns out their system had my modem MAC address entered incorrectly, there was an off-by-one typo that was hard to see so they were counting data from som

> "It turns out their system had my modem MAC address entered incorrectly, there was an off-by-one typo that was hard to see so they were counting data from some modem who knows where," how unlikely is this, really? a MAC address is 48 bits or 6 hex digits. what are the odds that mistyping one of those digits resolves to a MAC address of another Comcast customer? are they assigned randomly? why are people at Comcast typing in MAC addresses in situations as serious as billing and metering, in the first place?