Karl Denninger writes:
A T1 connected person launching a smurf can burn down an OC-12 if they
can find amplifiers with enough outbound capacity.
Which is to say a dozen well connected DS-3 networks -- not that hard
to find at all. Thankfully that number seems to be dwindling rapidly.
This will eventually degenerate to attackers searching for many dozens
of DS-1 networks that are open, so small providers/customers should be
educated as well.
The *ONLY* long-term fix for smurfing is to prohibit directed broadcasts,
I believe it has to include ingress source address validation.
The overall problem remains, getting others to deny spoofing and
directed broadcast responses can only be done though communication --
and sometimes excommunication is all that can be heard.
