Here's a list of KNOWN NETWORKS that are being used to ping
flood other networks. If one of your networks is in here, FILTER
BROADCAST PINGS NOW FROM ENTERING YOUR NETWORK. YOUR NETWORK IS BEING
USED TO ATTACK OTHER NETWORKS.
In my original e-mail, I noted that I suspected that there was
a list of known networks that could be used to attack other networks.
It appears my suspicion has been validated.
This is from source code for 'smurf.c', which is used to
generate the ICMP broadcast pings, as I described in an earlier e-mail
to this mailing list.