On 10/14/20 8:48 PM, Balakrishnan Balasubramanian wrote:
  Thanks! Got verbose logging. But not sure what is the
issue. Attaching logs. 
I'm not sure either.  It looks like kresd is doing nothing wrong.  The
two servers in **.ns.els-gms.att.net. don't appear to reply over UDP at
all and send garbage over TCP.  When I query the same IP addresses from
here they reply OK(-ish) and apparently also from other places (like
from other public resolvers or 
dnsviz.net).
It's possible that something in your network is interfering with the
queries.  Overall I suspect the cause will be hard to track down.
--Vladimir