DNS Service stops responding

ADahi · September 1, 2018, 10:10am

I’m running v6.42.6 on a CCR1009-8G-1S-1S+ at a large event.

Today under reasonable load (10k pps / 1Gbps WAN routing for ~1k users on ~20 vlans) i’ve experienced the Mikrotik DNS service stop responding to requests.

Clearing the cache, or changing the upstream DNS IP’s (or possibly even just clicking “apply”) seems to bring it back to life. This is making me wonder if this is a bug.. and if anyone else is having this issue.

I’ve been able to find a few posts online of the same symptoms, but they’re years old!

Here’s my DNS config.
/ip dns
set allow-remote-requests=yes cache-max-ttl=2h cache-size=8192KiB max-concurrent-queries=200 max-concurrent-tcp-sessions=40 \
    servers=9.9.9.9,149.112.112.112
Anyone else seeing issues like this?

http://forum.mikrotik.com/t/feature-request-ns-in-static-dns/54337/1