We don't trust our peers. We only accept routes which they are
registered as providing transit for in the PRDB. When the RADB is in
use, unless PSI has a route object for 1.0.0.0/8 in the RADB, we still
won't trust them when they try to pass us 1/8.
Then you're back to the www.pizzahut.com(192.112.170.243) example. Reachable
from most places as long as you don't touch NSFNET/ANSNET and the PRDB.