Threat Level: green Handler on Duty: Rob VandenBrink

SANS ISC: Suspiciously quiet on DNS scan activity - SANS Internet Storm Center SANS ISC InfoSec Forums

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Suspiciously quiet on DNS scan activity
One report that we run daily lists all attempts across our perimeter security for DNS Zone Transfer and All Records requests. I cannot remember a time where we did not see IPs that scan our entire /22 for one of these types. However, over the past 3 days, I have not seen these scans.

A review of port 53 ( in the ISC database is showing a drop in sources but not targets.

I realize that my view of Internet traffic is limited, but was wondering if anyone else was seeing this - or if it is even significant?

3 Posts
So, I guess I spoke too soon. Our little gremlins are back. I'll own that up to some sort of cycle in the 'scanners'. Still, three days of no activity seemed a little odd... Anonymous


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