/ip dns
set allow-remote-requests=yes cache-max-ttl=1d cache-size=2048KiB max-udp-packet-size=4096 query-server-timeout=2s query-total-timeout=10s servers=8.8.8.8,8.8.4.4,208.67.222.222,208.67.220.220
/ip firewall nat
add action=redirect chain=dstnat comment="re-route dns requests to Google DNS" dst-port=53 protocol=udp to-ports=53
add action=redirect chain=dstnat comment="re-route dns requests to Google DNS" dst-port=53 protocol=tcp to-ports=53
With about 700 connected users this system stops resolving after an hour or so for serveral client (not for all!)
The dns cache sits in our gateway router, a CCR1016-12G with 512Mb memory.
Someone told me the dns cache can only handle up to 100 parallel requests...
Ideas?