Querying locally on a nameserver - odd behavior

[Graham Clinch]

>>> I have a DNS server (which is both forwarder and authoritative NS) and I see this odd behavior locally on the host:
>>>
>>> dig @localhost   <name>    # returns immediately with right response
>>>
>>> dig @<host-local-ip-on-eth0>  <name>   # returns sometimes, timesout most of the time
 > [...]
> during this behavior, I saw lots of UDP packet loss on the host:
>
> netstat -s | egrep -A4 "Udp:"
> ...
> ..
>
>
> I tried similar local queries when traffic reduced (and when UDP pkt loss was zero) and both local queries succeeded.

Which version of Bind are you running?  This sounds like an issue I've 
seen with prefetch in 9.10 before 9.10.4.

https://kb.isc.org/article/AA-01315/0/prefetch-performance-in-BIND-9.10.html

Graham