[TriLUG] OT: Opinion about DNS service

[Brian via TriLUG]

On 08/03/2017 02:33 PM, Aaron Joyner wrote:
> Does it actually get an empty authoritative response, an NXDOMAIN
> failure, or a time out?  dig output would be idea.


It gets what I think is an empty authoritative response. The script 
automatically performs a `dig +trace` when a failure occurs; here is the 
latest one with security records stripped for readability:

; <<>> DiG 9.9.4-RedHat-9.9.4-38.el7_3 <<>> +trace cheetah.dynip.com
;; global options: +cmd
. 57030 IN NS l.root-servers.net.
. 57030 IN NS m.root-servers.net.
. 57030 IN NS a.root-servers.net.
. 57030 IN NS b.root-servers.net.
. 57030 IN NS c.root-servers.net.
. 57030 IN NS d.root-servers.net.
. 57030 IN NS e.root-servers.net.
. 57030 IN NS f.root-servers.net.
. 57030 IN NS g.root-servers.net.
. 57030 IN NS h.root-servers.net.
. 57030 IN NS i.root-servers.net.
. 57030 IN NS j.root-servers.net.
. 57030 IN NS k.root-servers.net.

;; Received 525 bytes from 209.18.47.62#53(209.18.47.62) in 564 ms

com. 172800 IN NS f.gtld-servers.net.
com. 172800 IN NS i.gtld-servers.net.
com. 172800 IN NS g.gtld-servers.net.
com. 172800 IN NS d.gtld-servers.net.
com. 172800 IN NS a.gtld-servers.net.
com. 172800 IN NS m.gtld-servers.net.
com. 172800 IN NS h.gtld-servers.net.
com. 172800 IN NS e.gtld-servers.net.
com. 172800 IN NS c.gtld-servers.net.
com. 172800 IN NS j.gtld-servers.net.
com. 172800 IN NS k.gtld-servers.net.
com. 172800 IN NS b.gtld-servers.net.
com. 172800 IN NS l.gtld-servers.net.

;; Received 1177 bytes from 202.12.27.33#53(m.root-servers.net) in 987 ms

dynip.com. 172800 IN NS altair.canweb.ca.
dynip.com. 172800 IN NS discovery.dynip.com.
dynip.com. 172800 IN NS ns3.dynip.com.

;; Received 635 bytes from 192.41.162.30#53(l.gtld-servers.net) in 14865 ms

;; Received 12 bytes from 204.225.44.10#53(discovery.dynip.com) in 199 ms


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