How to solve dns parsing exception

The solutions to DNS parsing anomalies are: replacing local DNS, modifying HOSTS file, clearing DNS cache information, etc.

1. Changing local DNS

Some operators will interfere with users' normal Internet access by using the method of DNS hijacking, so that users can't access the corresponding sites. To deal with this situation, we can solve the problem of resolution failure caused by DNS hijacking by changing local DNS.

2. Modify the HOSTS file

HOSTS file is a local file that records the one-to-one correspondence between domain names and IP addresses in the operating system, and its request priority is higher than global recursive query. If the domain name server we want to visit is stable and does not change frequently, we can directly modify or add the corresponding relationship between domain name and IP address in the HOSTS file, so as to avoid the problem of DNS resolution error.

3. Clear DNS cache information

If the resolution record of the domain name changes or the DNS cache is artificially modified, the user will be pointed to an unreachable or wrong site, so in order to ensure the accuracy of resolution, we need to clean the DNS cache regularly.

traditional physical deployment of DNS

traditional domain name resolution servers are generally deployed by single machine. In order to further improve security and resolution performance, security devices and load balancers are adopted. DNS servers are used to handle DNS requests of users. Load balancers are DNS cluster devices introduced to solve the problem of insufficient performance of single servers, and security devices are introduced to solve system security.

however, the traditional DNS structure is often insufficient to deal with DDoS attacks, and there are also some problems in the reliability and performance of the DNS system, and its system performance, analysis service ability, security protection and other aspects can not meet the requirements of 1% availability of DNS services.

to solve this problem, domain name registration authorities and network operators mostly use AnyCaLst technology to deploy DNS domain name resolution service system, so as to achieve server load balance, enhance service reliability, improve response time to distributed denial of service attacks, and further improve resolution service performance.