The present disclosure provides a domain name resolution system, a domain name resolution server, and a domain name resolution method. The domain name resolution method comprises following steps: configuring a same extensive domain name for portal domain names using a same server group; resolving a domain name requested by the client to a portal domain name via a CNAME; performing resolving on the portal domain name, and using a resolution result as the resolution result of the domain name requested by the client to be sent back to the client. The present disclosure provides a one-layer CNAME record method based on extensive domain name that, with respect to the existing method, reduces CNAME record analysis by one layer of system domain name, thereby shortening resolution time of the system domain name and decreasing a resolution failure of the system domain name; simultaneously, the scheduling time of the server based on the system domain name is shortened and the configuration amount is decreased. The present disclosure further supports a special back-to-source configuration or other special configurations, and the added configuration amount is relatively small; when being attacked, the specific client under attack may be easily found.
展开▼
