Dig -x +trace?

[Mark Andrews]

> On 30 Sep 2022, at 07:50, Mike Hodson <mystica at gmail.com> wrote:
> 
> I'm attempting to figure out how/why my reverse DNS delegation is broken.
> I've already deleted systemd-resolved's temporary resolv.conf and added in an immutable single line 
> nameserver 1.1.1.1
> resolv.conf.
> 
> I can dig +trace forward hostnames fine.
> I cannot dig -x an ip +trace.
> All I get is the root-servers instead of any sort of reverse looking up happening at all.
> What am I doing wrong?

Hiding the actual address you are wanting the reverse lookups for.  Really you have an incredible resource here of knowledgeable people with millennia of experience between them who would have looked at every delegation and then would have told you what they saw that was wrong.  

Not installing maintenance releases when they are released.  dig +trace is a little fragile in 9.18.1 following the change to libuv.  Upgrade to a current release.

> Thanks,
> 
> Mike
> 
> $ dig -x 208.x.x.x +trace 
> 
> ; <<>> DiG 9.18.1-1ubuntu1.1-Ubuntu <<>> -x 208.x.x.x +trace 
> ;; global options: +cmd 
> .                       509855  IN      NS      a.root-servers.net. 
> .                       509855  IN      NS      b.root-servers.net. 
> .                       509855  IN      NS      c.root-servers.net. 
> .                       509855  IN      NS      d.root-servers.net. 
> .                       509855  IN      NS      e.root-servers.net. 
> .                       509855  IN      NS      f.root-servers.net. 
> .                       509855  IN      NS      g.root-servers.net. 
> .                       509855  IN      NS      h.root-servers.net. 
> .                       509855  IN      NS      i.root-servers.net. 
> .                       509855  IN      NS      j.root-servers.net. 
> .                       509855  IN      NS      k.root-servers.net. 
> .                       509855  IN      NS      l.root-servers.net. 
> .                       509855  IN      NS      m.root-servers.net. 
> .                       509855  IN      RRSIG   NS 8 0 518400 20221012170000 20220929160000 20826 . FkcsBmNz2oK02ARhYfNSfxbnEL93RITDteQtHQoPn8zHZg9B6BRXqkH9 +UpAEViDraX+4l8YJiUvYzrHh9twpQry0vv7xgDLoDdU9kRqokG5DEoq Ueqph6qleC6Vylga4f1MzW
> N+Dh9zK9/eCSp6WxwgbnW53a9GMDbI5KWZ WkcWw3IPHVvVwDZfWhrKJtKZ3hafsGgmigm9F01Xk17prOAS6jBbvYjT jCUyTl3UZJ+bAKS4tkpFdjp78raxBKBQPN6TzdLjtxYQrhriZZ3Gjdcg dT+WQkLGYuyeakm2JqVe9vXGMGn0XkZEGMYnh7iW80N1XHyBMfhzGO+s 61zvWA== 
> ;; Received 1097 bytes from 1.1.1.1#53(1.1.1.1) in 12 ms
> 
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka at isc.org