When performing QNAME minimization, named now sends an NS
query for the original QNAME, to prevent the parent zone from
receiving the QTYPE.
For example, when looking up example.com/A, we now send NS queries
for both com and example.com before sending the A query to the
servers for example.com. Previously, an A query for example.com
would have been sent to the servers for com.
Several system tests needed to be adjusted for the new query pattern:
- Some queries in the serve-stale test were sent to the wrong server.
- The synthfromdnssec test could fail due to timing issues; this
has been addressed by adding a 1-second delay.
- The cookie test could fail due to the a change in the count of
TSIG records received in the "check that missing COOKIE with a
valid TSIG signed response does not trigger TCP fallback" test case.
- The GL #4652 regression test case in the chain system test depends
on a particular query order, which no longer occurs when QNAME
minimization is active. We now disable qname-minimization
for that test.
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