NIST IPv6 document

Owen DeLong owen at
Thu Jan 6 12:20:06 CST 2011

On Jan 5, 2011, at 7:18 PM, Dobbins, Roland wrote:

> On Jan 6, 2011, at 10:08 AM, Joe Greco wrote:
>> Packing everything densely is an obvious problem with IPv4; we learned early on that having a 48-bit (32 address, 16 port) space to scan made
>> port-scanning easy, attractive, productive, and commonplace.
> I don't believe that host-/port-scanning is as serious a problem as you seem to think it is, nor do I think that trying to somehow prevent host from being host-/port-scanned has any material benefit in terms of security posture, that's our fundamental disagreement.
You are mistaken... Host scanning followed by port sweeps is a very common threat and still widely practiced in IPv4.

> If I've done what's necessary to secure my hosts/applications, host-/port-scanning isn't going to find anything to exploit (overly-aggressive scanning can be a DoS vector, but there are ways to ameliorate that, too).
And there are ways to mitigate ND attacks as well.

> If I haven't done what's necessary to secure my hosts/applications, one way or another, they *will* end up being exploited - and the faux security-by-obscurity offered by sparse addressing won't matter a bit.
Sparse addressing is a win for much more than just rendering scanning useless, but, making scanning useless is still a win.


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