We run our DNS off of our Mikrotik CORE router. What is the recommended cache size? If I set to 5000, DNS queries are brutally slow once the cache is fulll.... We use OPEN DNS for our dns queries. Our CORE router has a max CPU usage of 11%.
What has prompted me playing with all this is that we used to have a NAT rule masq. requests (forcing) all DNS requests through our DNS... we have been starting to get ALOT of page not found errors. I think it must be over loading or something.
Should we be using a seperate DNS box instead of using our CORE?
Any recommendations?
We service over 2500 users on our network.