[dns-operations] blocking recursers

Paul Vixie paul at vix.com
Sun Mar 26 02:37:38 UTC 2006

# check the RA bits?

ask an RD=1 question about a nonexistent name in the root zone.  if you
get back NXDOMAIN it answered you recursively.  if you get back a referral
to the root, or REFUSED or something else, it answered you authoritatively.

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