direct queries of reverse zone, [not] using CNAME hack

[Justin Pryzby]

Hi Everyone,

We have CIDR/29 reverse DNS delegated to us using the CNAME hack:

> 109.216.80.206.in-addr.arpa is an alias for 109.104-111.216.80.206.in-addr.arpa.
> 109.104-111.216.80.206.in-addr.arpa domain name pointer athena.norchemlab.com.

Every day we get a few queries to our published nameservers not for the
109.104-111.216... record, but for the 109.216...directly.

Aug 26 13:50:42 athena named[12641]: client 193.108.155.114#53495: view ext: query (cache) '109.216.80.206.in-addr.arpa/PTR/IN' denied
Aug 26 13:50:42 kenny named[6387]: client 193.108.155.114#61543: view external: query (cache) '109.216.80.206.in-addr.arpa/PTR/IN' denied
Aug 26 17:10:21 kenny named[6387]: client 193.108.92.65#50992: view external: query (cache) '110.216.80.206.in-addr.arpa/PTR/IN' denied
Aug 26 17:10:21 athena named[12641]: client 193.108.92.65#59431: view ext: query (cache) '110.216.80.206.in-addr.arpa/PTR/IN' denied
Aug 25 08:33:52 kenny named[6387]: client 65.59.243.55#51757: view external: query (cache) '107.216.80.206.in-addr.arpa/PTR/IN' denied
Aug 25 08:33:52 athena named[12641]: client 65.59.243.55#49414: view ext: query (cache) '107.216.80.206.in-addr.arpa/PTR/IN' denied
Aug 23 17:45:40 athena named[12641]: client 193.108.92.65#53099: view ext: query (cache) '104.216.80.206.in-addr.arpa/PTR/IN' denied
Aug 23 17:45:40 kenny named[6387]: client 193.108.92.65#64805: view external: query (cache) '104.216.80.206.in-addr.arpa/PTR/IN' denied
Aug 23 22:52:46 kenny named[6387]: client 72.247.122.151#50456: view external: query (cache) '106.216.80.206.in-addr.arpa/PTR/IN' denied
Aug 23 22:52:46 athena named[12641]: client 72.247.122.151#60317: view ext: query (cache) '106.216.80.206.in-addr.arpa/PTR/IN' denied

Is that due to some broken nameservers that can't handle the CNAME or a PTR
with 6 components, a probe, or ??

Thanks,
Justin