2 4 5
The dnsFailoverNonAuth testvar contains a list of non-authoritative DNS response error codes that cause the DNS proxy to failover. If no error codes cause failover, the value should be set to ‘none’. DNS clients based on bind normally failover of error codes 2, 4, and 5. Windows based DNS clients normally failover on all nonzero error codes except 3.
NOTE: It is possible that an implementation treats the authoritative and non- authoritative responses the same. In the case the values of testvar dnsFailoverAuth and dnsFailoverNonAuth will be the same.