Records below delegation are not ignored

[SivaKesava1]

Hello,

This issue was discovered with test case 156

The test zone file is:

www.www.				      500 IN SOA	ns1.outside.edu. root.campus.edu. 3 604800 86400 2419200 604800
www.www.				      500 IN NS		ns1.outside.edu.
bar.www.www.				      500 IN NS		bankcard.net.mybankcard.email.
*.bar.www.www.				      500 IN CNAME	uni.www.
uni.bar.www.www.			      500 IN DNAME	www.www.

The response for the query <example.bar.www.www., DNAME> from Technitium server is:

          "opcode QUERY",
          "rcode NOERROR",
          "flags QR AA RA",
          ";QUESTION",
          "example.bar.www.www. IN DNAME",
          ";ANSWER",
          "example.bar.www.www. 500 IN CNAME uni.www.",
          ";AUTHORITY",
          ";ADDITIONAL"

whereas the response from others was:

          "opcode QUERY",
          "rcode NOERROR",
          "flags QR",
          ";QUESTION",
          "example.bar.www.www. IN DNAME",
          ";ANSWER",
          ";AUTHORITY",
          "bar.www.www. 500 IN NS bankcard.net.mybankcard.email.",
          ";ADDITIONAL"

According to RFC 2181, any data below the zone cut should not appear on the parent side. The records below the delegation cut should be ignored. This issue has been fixed by other implementations.

• https://gitlab.nic.cz/knot/knot-dns/-/issues/713
• NS Records below delegation are not ignored (nsd-checkzone also does not raise any issue) NLnetLabs/nsd#174
• Records below delegation are not ignored  yadifa/yadifa#12

[ShreyasZare]

Thanks for the feedback. Will get this fixed soon.

[ShreyasZare]

Thanks again for the report. Technitium DNS Server v11.5.2 is now available that fixes this issue. Do update and let me know your feedback.