Free test for DNS port vulnerability

[Jeff Lightner]

FYI:  If you go to http://www.dnsstuff.com/ there is a free test to see
if your DNS server is considered vulnerable.
Not shilling for them.   There other tools are NOT all free - just
noting this specific test as it appears they've just added it and it's a
good way to confirm from outside that the port being used to query is a
random one and not 53.   It doesn't seem exhaustive but might be a nice
additional check to do.
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