On 19.02.16 17:08, blrmaani wrote:
We have a DNS setup where we forward a name in one domain to 5 external
nameservers. We see NXDOMAIN error intermittently (once in couple of
weeks). How do I debug this issue?
tcpdump?
I took a cache dump on our DNS and 2 out of 5 nameserver IPs appear in "Unassociated
entries" when the problem happens.
anything more isble in the cache?
last time I have encountered this error, it was problematic Cisco DNS load
balancer, responding NXDOMAIN to a PTR (and possibly other) type queries,
while standard types returned proper answer.
--
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