Method for dynamically changing domain name service retrieving sequence

Abstract

The invention relates to a method for dynamically changing a domain name service retrieving sequence. The method is characterized in that NAPTR (Naming Authority Pointer) record search is dynamically regulated. In the NAPTR record searching process, a weight field, a dynamic data detection function and a heartbeat detection function are firstly set; in an IMS (IP Multimedia Subsystem) core network, an FQDN (Fully Qualified Domain Name) is information which can be identified by the IMS core network; an IP (Internet Protocol) address is transferred as a target address; if the IP address is unavailable, the FQDN is transferred as a final target address; the weight value of the IP is more than that of the FQDN; and the weight value of the FQDN is more than that of a common domain name. The resource record is dynamically regulated to save times to try to inquire the resource records as much as possible so as to improve the efficiency.

Description

technical field [0001] The invention belongs to the field of network technology, and in particular relates to a method for dynamically changing the domain name service retrieval sequence. Background technique [0002] The Domain Name Service (DNS) is a distributed database that stores the name of the transmission control protocol and its corresponding IP address, each of which is called a resource record (RR), where each resource record is marked to be retrieved Order. DNS query is divided into three ways: NAPTR query, SRV query and A-query. The existing technical solution is: when the next hop of the user cannot be resolved, DNS will be queried through the above-mentioned DNS query method. Therefore, the NAPTR query must first be performed. After this query, if the specific target address cannot be obtained , then it is necessary to perform SRV query (to get the port number) and A- (to get the IP) query. In addition, for the settings of the DNS server itself, the priori...

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Problems solved by technology

[0003] Finally, for the queried record, whether it is registration or phone call, the record will not be remembered, which leads to the time-consuming query of the information, and the result of the record must be queried again

The disadvantages of the prior art are: 1) after the NAPTR query, if the specific target address cannot be obtained, then SRV query (to obtain the port number) and A- (to obtain the IP) query will be performed, thereby reducing the query efficiency and consuming Duration; 2) Since the priority query order of each record has been pre-set in DNS, if one of the records with higher weight is unreachable for some reason or due to overload, when accepting new registrations or calls, This record will not be automatically deleted or the weight will be lowered automatically. As a result, all users will always have to query this record first, and then continue to query after confirming that it is unavailable, which greatly reduces efficiency and takes a long time

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