Method and system for increasing speed of domain name system resolution within a computing device
A system for resolving domain name system (DNS) queries, contains a communication device for resolving DNS queries, wherein the communication device further contains a memory and a processor that is configured by the memory, a cache storage for use by the communication device, and a network of authoritative domain name servers, where in a process of the communication device looking up a DNS request within the cache storage, if the communication device views an expired DNS entry within the cache storage, the communication device continues the process of looking up the DNS request in the cache storage while, in parallel, sending out a concurrent DNS request to an authoritative domain name server that the expired DNS entry belongs to.
1. A method for resolving Domain Name System (DNS) queries for use with a network of authoritative domain name servers and a communication device configured to resolve DNS queries, the communication device comprising a cache storage, the method comprising the communication device performing the steps of:
receiving a first DNS request;
identifying a DNS entry within the cache storage;
checking if the DNS entry is an expired DNS entry; and
if the DNS entry is an expired DNS entry, sending out a query of second DNS request to an authoritative domain name server that the expired DNS entry belongs to.
2. The method according to claim 1 , further comprising the step of in parallel to the sending out the query, looking up the first DNS request within the cache storage.
3. The method according to claim 1 , further comprising the step of:
receiving a final result from the authoritative domain name server in response to the sent query;
storing the final result in the cache storage; and
using the final result to resolve the expired DNS entry if the same answer as the expired DNS entry is received as the final result.
4. The method according to claim 1 further comprising the step of:
receiving a final result from the authoritative domain name server in response to the sent query;
storing the final result in the cache storage; and
using the final result to resolve the expired DNS entry if the final result is different from the expired DNS entry.
5. The method according to claim 1 further for use with an external DNS recursor, wherein the step of looking up the first DNS request within the cache storage comprises communicating with the external DNS recursor and the external DNS recursor directly looking up the DNS request within the cache storage.
6. The method according to claim 1 wherein the step of in parallel to the sending out the query, looking up the first DNS request within the cache storage is repeated each time an expired DNS entry is detected within the cache storage.