Host Detective: Common Domain Name Resolution RecordUS web hosting
After purchasing domain names and host space in the United States, if you want the website to be accessed normally, another important step is to do a good job i...
After purchasing domain names and host space in the United States, if you want the website to be accessed normally, another important step is to do a good job in domain name resolution. Only after the domain name is successfully resolved, the website can be accessed.
Generally speaking, the most common thing many friends do is to parse A records of domain names. In fact, there are many types of domain name parsing records. In order to let more novice webmasters operate and manage their own domain names, host detectives here briefly introduce common types of domain name parsing records.
1. A record type; the domain name A (Address) record is used to specify the IP address record corresponding to the host name (or domain name). Users can point the domain name to the IP corresponding to the space through the domain name A record. Generally speaking, A record is the IP of host space. After setting A record for domain name, when entering domain name, it means the IP of space corresponding to A record in DNS. Simply put, A record specifies the IP address corresponding to the domain name.
When using American hosts, if the space is independent IP, the domain name can be accessed directly through domain name after A record resolution; if it is shared IP, the domain name can be accessed through domain name after A record resolution only after the host agrees to bind the domain name.
Host Detective: Common Types of Domain Name Resolution Records
2. NS record; NS (Name Server) record refers to the domain name server record, which is used to specify which DNS server will parse the domain name. Generally, when registering domain names, there are default DNS servers, and domain names are also resolved by a DNS domain name server. The general form of NS record address for DNS server is ns1/ns2.ojhost.com.
It should be noted that when you set up the domain name NS, you may often change the NS records. This must change the NS server that suits you, otherwise it will have a negative impact on the speed of website access.
3. MX records; MX (Mail Exchanger) records are mail exchange records, which point to a mail server and are generally used in mail services. When using American space, many users like to use their own domain name suffix mailbox to send mail. Then you need to set up the MX record of the domain name. When the domain MX record is set, the user can send the mail to the mail server specified by the MX record.
Because everyone likes to use domain name suffixes as enterprise mailboxes, MX records are also very common and important domain name resolution records. However, compared with other domain name parsing records, MX records may be slightly more complex to set up, many friends will have errors in setting up, here we suggest that you be familiar with the setting method of MX records before setting up.
4. CNAME records; CNAME (Canonical Name) is an alias record that allows multiple names to be mapped to the same computer. Usually used for servers that provide both WWW and mail functionality.
For example, there is a server named "host.idcspy.com" (A record), which provides both WWW and mail services. To facilitate user access, the computer can be set up two alias records, namely WWW and mail. The full names of the two aliases are "www.idcspy.com" and "mail.idcspy.com", which actually point to "host.idcspy.com". In practical applications, when we enter the address at the beginning of "www" in the URL box, it sets up CNAME records.
5. TXT record; TXT record refers to the description of a host name or domain name, which is seldom used in common domain name resolution settings. If you need to manage many domain names, you can also set the TXT record of the domain name.
6. TTL record; TTL (Time-To-Live) is a value of IP protocol package, which tells the network router whether the packet is too long in the network and should be discarded. The initial value of TTL is usually the default value of the system, which is the 8-bit field in the header.
The original idea of TTL was to determine a time range beyond which packets would be discarded. Since each router has to subtract at least one TTL domain, TTL usually represents the maximum number of routers a packet can pass before it is discarded. When counting to zero, the router decides to discard the packet and send an ICMP message to the original sender. In short, the TTL value is the retention time of a domain name resolution record in the DNS server.
These are the common types of domain name resolution records, of course, domain name analysis and application settings are far more than these. For example, PTR value of domain name, pause domain, pan-domain name, sub-domain name and so on belong to the domain name setting category, which will not be discussed here.
Finally, the reason why various resolution settings of domain names can be realized is that there is a DNS (Domain Name System) domain name management system. Because domain name resolution needs to be done by a dedicated domain name resolution server, and DNS is the server for domain name resolution.
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