[dns-operations] question on dns setup, name-servers on adjacent IPs

[Stephane Bortzmeyer]

On Thu, Aug 25, 2016 at 12:22:25AM -0400,
 Andrew Boling <aboling at gmail.com> wrote 
 a message of 105 lines which said:

> It could also be poorly written software. Without knowing the
> software the authoritative server runs, it's not obvious what is at
> fault here.

Most name server software follow the RFC. The problem typically does
not come from the server, but from the broken middlebox that some
people wrongly put in front of it (a common setup, even if it is quite
wrong).