In this article I am going to walk you through the necessary steps to configure your Asus RT-AC66U as a caching dns server using bind. According to Wikipedia – “Caching name servers (DNS caches) store DNS query results for a period of time determined in the configuration (time-to-live) of each domain-name record. DNS caches improve the efficiency of the DNS by reducing DNS traffic across the Internet, and by reducing load on authoritative name-servers, particularly root name-servers. Because they can answer questions more quickly, they also increase the performance of end-user applications that use the DNS. Recursive name servers resolve any query they receive, even if they are not authoritative for the question being asked, by consulting the server or servers that are authoritative for the question. “
As you must already know, the Asus RT-AC66U runs Busybox, which is a very small but powerful embedded Linux distro. Because of this there are a lot of familiar commands available via the CLI. However, don’t get to comfortable, as this is still a very foreign land.
Note that this article assumes that you have ssh or telnet working and can log into your RT-AC66U via the CLI.