Forwarding issues related to MACs starting with 4 or 6
I wonder how many bugs there are like this in low-level networking infrastructure that cause issues which go undiagnosed for <i>years</i> before someone with enough knowledge to diagnose them figures it out. I keep reading about weird networking glitches triggered by specific bit patterns, but certainly if I ever encountered such a think I don't think I'd be able to diagnose it.