Using unallocated address space - for DoS?

Once again, you don't need to break into someone else's routers. This
isn't an exploit list, so I'm not going to post a cookbook on how to do
it. But due to the limited protection in some networks, it remains a
relatively simple attack or accident waiting to happen.

Why break into a bank, when you can push a button on the side of the
building and money comes out. Unlike a cash machine, where you need
to know at least a PIN in addition to some working bank account number,
you can wipe out almost any IP address you don't like with essentially
no authentication.