DNS records require specific domain name settings in different environments, and accordingly there will be different records to represent and describe. For example, the A (Address) record is used to specify the IP address record corresponding to the host name (or domain name). Users can point the website server under this domain name to their own web server. Records (CNAME) are also called canonical names. This type of record allows you to map multiple names to the same computer. Through MX (Mail Exchange) records, users can point the mail server under the domain name to their own mail server, and then control all mailbox settings by themselves.
The NS (Name Server) record we are going to talk about today is a domain name server record, which is used to specify which DNS server will resolve the domain name. When we use domain name resolution, the background operation will include domain name management. Especially when we choose intelligent DNS resolution, we often encounter some NS-related problems during the domain name management process. For example, domain name transfer, as well as related operations such as addition, modification, deletion in record interpretation, etc. will involve NS issues.
We know that DNS plays a very important role in the network, and its status can be described as pivotal. Therefore, whether the DNS is normal or not directly affects the normal operation of the entire network, and also involves related security issues. In this case, for safety reasons, there are usually multiple backup servers available for use in the event of machine failure. These servers are grouped together and are called server groups. A server group contains at least two servers.
Figure 1:
Since there are different servers, corresponding records will be used when parsing using different servers. The resolution server record NS is used to indicate which server resolves the domain name. The NS records here only take effect for subdomain names. For example, if the user wants news.abc.cn to be parsed by the server 11.22.33.44, the NS record of news.abc.cn needs to be set.
Here, you can fill in either the IP address or a host address like ns1.qyinc.cn in "IP Address/Host Name", but you must ensure that the host address is valid. For example, point the NS record of news.abc.com to ns1.qyinc.cn. When setting the NS record, you also need to set the point of ns1.qyinc.cn, otherwise the NS record will not be parsed normally; ?NS records take precedence over A Record. That is, if a host address has both an NS record and an A record, the A record will not take effect. The NS records here only take effect for subdomain names.
Related operations of NS records
1) Add NS record
Fill in the name of the subdomain in "Host Name", "Type" is NS, fill in the IP address or name of the resolution server (such as ns.abc.com) in "IP Address/Host Name", and click "Add" Just click the button.
2) Modify NS records
Just change the original server target address or IP directly to the new address or IP in the "IP Address/Host Name" column, and then click the "Modify" button.
3) Delete NS records
Just click the "Delete" button corresponding to the NS record you want to delete.
Among DNS-related records, NS's status is not as high as that of A records and C records, and there are not so many articles and materials describing it in detail, but it is still important. (Source: http://dns.qy.com.cn )