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NODATA answers missin SOA in authority section after CNAME chain · Issue #142 · NLnetLabs/nsd · GitHub
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Description
Version: nsd 4.3.2-1 on Arch, x86_64
SOA RR is missing in authority section of NODATA answers when NODATA happens to be at the end of a CNAME chain. This most likely leads to suboptimal caching (especially for non-existing AAAA).
Reproducer:
- config_and_zone.zip
- run
nsd -V5 -c nsd.conf -d - check that node exists:
$ dig @127.0.0.1 txt9.txt8.test. TXT
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50871
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;txt9.txt8.test. IN TXT
;; ANSWER SECTION:
txt9.txt8.test. 9 IN CNAME txt10.txt9.txt8.test.
txt10.txt9.txt8.test. 10 IN TXT "TXT is the only type here"
;; AUTHORITY SECTION:
test. 878 IN NS ns.test.
- see that NODATA answer for a non-TXT type is missing SOA:
$ dig @127.0.0.1 txt9.txt8.test. A
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 8644
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;txt9.txt8.test. IN A
;; ANSWER SECTION:
txt9.txt8.test. 9 IN CNAME txt10.txt9.txt8.test.
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