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  • Please edit your Question to include the output of scutil --dns. That shows the real DNS server landscape your Mac is dealing with. macOS has a sophisticated system of scoped DNS query routing to handle things like VPNs (but not just VPNs). BTW, macOS tries to use DNS servers in the specified order, but if a server fails to give a response within 1 second, it gets put in the penalty box and the next server gets used. So one thing you may need to do is make sure your preferred DNS server is fast and reliable.
    – Spiff
    Commented Feb 25, 2017 at 23:21
  • @Spiff Thanks for looking -- I have edited the question for the extra output you requested Commented Feb 26, 2017 at 7:03
  • Now I wonder how your Mac is every learning of the external IP address of njj.chickenkiller.com if the only DNS server you're ever giving it is 192.168.2.4. Is there any chance that server is sometimes giving the external IP address as an answer? What does dns-sd -q njj.chickenkiller.com 255 255 report? (note: you have to Ctrl-C to exit dns-sd otherwise it'll sit forever looking for new answers or changes)
    – Spiff
    Commented Mar 10, 2017 at 20:51
  • @Spiff Question edited with additional data as requested. Many thanks Commented Mar 11, 2017 at 9:39