[dns-operations] ENT NXDOMAIN problem at .BS nameserver ns36.cdns.net

[Viktor Dukhovni]

The .COM.BS is an empty non-terminal with various child domains
registered beneath.  The "ns36.cdns.net" nameserver for .BS responds
with NXDOMAIN to "com.bs" qname-minimised queries.

This in turn can and does sometimes lead to NXDOMAIN inference for the
child domains.

This nameserver needs to be withdrawn and fixed before it is returned to
service.

    2001:678:4::24    ns36.cdns.net
    194.0.1.36        ns36.cdns.net

Example responses:

@194.0.1.36

    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 3297
    ;; flags: qr aa; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

    ;; OPT PSEUDOSECTION:
    ; EDNS: version: 0, flags:; udp: 4096
    ;; QUESTION SECTION:
    ;com.bs.                        IN SOA

    ;; AUTHORITY SECTION:
    bs.                     SOA     dns.nic.bs. bsadmin.cob.edu.bs. 2022092000 3600 900 1814400 9000

@2001:678:4::24

    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 39616
    ;; flags: qr aa; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

    ;; OPT PSEUDOSECTION:
    ; EDNS: version: 0, flags:; udp: 4096
    ;; QUESTION SECTION:
    ;com.bs.                        IN SOA

    ;; AUTHORITY SECTION:
    bs.                     SOA     dns.nic.bs. bsadmin.cob.edu.bs. 2022092000 3600 900 1814400 9000

-- 
    Viktor.