SMURF amplifier block list

Stephen Sprunk sprunk at
Tue Apr 14 20:25:34 UTC 1998

Are we really concerned about being smurfed by a /30, or even a /27?

The essential problem is backbone class-C's, especially those in NAPs
where coordination is nearly impossible.  Smaller subnets tend to be in
small ISPs' or customers' networks, which don't pose a threat since they
lack the bandwidth for an effective attack.


Karl Denninger wrote:
> The larger problem is that subnetted /24s still are wide open.  This kind of
> filter won't block anything from their broadcast addresses, since they're
> not the .255 address.

Stephen Sprunk      "Oops."                 Email: sprunk at
Sprint Paranet        -Albert Einstein      ICBM:  33.00151N 96.82326W

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