[nsp] known networks for broadcast ping attacks
Jay R. Ashworth
jra at scfn.thpl.lib.fl.us
Thu Jul 31 05:19:24 UTC 1997
On Wed, Jul 30, 1997 at 10:15:24PM -0700, Joe Rhett wrote:
> > .255 is _always_ a broadcast address, no?
>
> Uh, no. If the bit mask is smaller than /24, any given .255 address could
> be legitimate.
RFC 917 and RFC 922 (admittedly old) suggest strongly that this isn't a
good idea; I'm still searching to find the reference I remember that
specifically deprecates it.
I guess it matters, since I'm not aware of routers that allow the
specification of filter rule addresses with /netsizes.
Cheers,
-- jra
--
Jay R. Ashworth jra at baylink.com
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