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.


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