This article lets you first understand the following basic concepts, if you have been familiar with the relevant concept, please enter the "Configuration Question of the DNS Server (2)".
Related concepts [transfer]
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What is an IP address? The IP address is assigned to 32-bit digital identifiers to each computer or network device on the network. On the Internet, the IP address of each computer or network device is unique worldwide. The format of the IP address is xxx.xxx.xxx.xxx, where xxx is any integer between 0 and 255. For example, the IP address of the Komai website host is 210.22.12.54.
What is a fixed IP address? The fixed IP address is the IP address used to a computer or network device for a long time. In general, the computer with a specialline net has a fixed Internet IP address.
What is a dynamic IP address? Internet access by MODEM, ISDN, ADSL, wired broadband, cell broadband, etc., all the IP addresses allocated every time the Internet is different, which is the dynamic IP address. Because IP address resources are terrible, most users are online through dynamic IP addresses.
What is the intranet, what is a public network, what is the NAT? Public network, the intranet is two Internet access methods. Internal network access method: The IP address obtained by the Internet is the reserved address on the InetNET, and the retention address has three forms: 10.xxx 172.16.xx to 172.31.xx 192.168.xx internal network computer with NAT (network address Conversion) protocol, access the Internet through a public gateway. The intranet computer can send a connection request to other computers on the Internet, but other computers on the Internet cannot send a connection request to the internal network computer. Public Internet access: The IP address obtained by the Internet is the non-reserved address on the InetNET. Other computers on the public network and other computers on the Internet can be accessed freely. NAT (Network Address Translator) is a network address transformation. It implements mutual conversion between the IP address of the intranet and the address of the public network, converts a large number of intranet IP addresses to one or a small amount of public IP address, reduce the public The web IP address is occupied. The most typical application of NAT is: In a local area, you only need a computer to connect to the Internet, you can use the NAT shared Internet connection to make the other computers within the LANs can also be internetrated. With the NAT protocol, the computer within the LAN can access the computer on the Internet, but the computer on the Internet cannot access the computer in the LAN. Windows operating system Internet Connection, Sygate, WinRoute, UNIX / Linux's NATD and other software, are shared using the NAT protocol. All ISP (Internet Service Providers) provided by the intranet access method, almost all based on NAT protocols.
What is the domain name? What makes a domain name? The domain name is the name used to find the website on the Internet. It is an important identifier on the Internet, which is equivalent to the host's house number. Each host corresponds to an IP address, and each IP address consists of a series of numbers, such as 101.25.11.34. In order to facilitate memory, use domain names to search for these numbers, such as mydomain.com. Each domain name and the IP address are one or one, and people enter the domain name, and then resolved into IP addresses by the Domain Name Server (DNS) to find the corresponding website. Every URL and Email use the domain name. In English international domain name, the domain name can be in English letters and Arabic numbers and horizontal bars, "-", up to 67 characters (including suffix), and the case of the letter does not distinguish, each hierarchical cannot exceed 22 letter. In the domestic domain name, the length of the three domain name must not exceed 20 words. What is the DNS? Domain Name Management System DNS (Domain Name System) is the meaning of the domain name resolution server. It is in the Internet to convert the domain name into the IP address that the network can be identified. For example: We entered when online www.163.com Automatic conversion becomes 202.108.42.72
What is a record? A (address) Record is used to specify the IP address record corresponding to the hostname (or domain name). Users can point to the website server under this domain to their own Web Server. You can also set the secondary domain name of your domain name.
What is NS record? NS (Name Server) Record is a domain name server record to specify which DNS server is parsed by this domain name.
What is an alias record (CNAME)? Also known as a normative name. This record allows you to map multiple names to the same computer. It is usually used to provide a computer that provides both WWW and MAIL services. For example, there is a computer name "host.mydomain.com" (a record). It offers WWW and MAIL services, in order to facilitate user access services. Two alias (CNAME) can be set for the computer: WWW and MAIL. The full name of these two alias is "www.mydomain.com" and "mail.mydomain.com". In fact, they all point to "Host.Mydomain.com".
What is the general domain name parsing? The general domain name resolution is defined as: the customer's domain name A.com, which is set to the same IP address below * .a.com. For example, customers set up B.A.com, they will automatically resolve to the same IP address with A.com.
What is MX record? MX (Mail Exchange) record is a mail exchange record, pointing to a mail server, locating the mail server based on the recipient's address suffix when email the email. For example, when a user on the Internet wants to send a letter to user@mydomain.com, the user's mail system looks for MX records for mydomain.com's domain name by DNS. If the MX record exists, the user's computer is sent to MX records on the specified mail server.
Wan Net MX Record Settings
Hi network 3322.org dynamic domain name MX record settings
Peanut shell dynamic domain name setting
Check that the MX record is available for a very useful tool for the DNS query is Nslookup, which can use it to query various data in the DNS. You can run NSLookup directly in Windows command line to enter an interactive mode where you can query various types of DNS data. DNS's name parsing data can have a variety of different types, with SOA type data for setting this zone parameter, with a type A-type data for the IP address corresponding to the name, with MX type data for setting mail exchange. These different types of data can be queried by NSLookup interaction mode, and you can use the set type command to set the corresponding query type during the query process. Such as: C: /> nslookupDefault Server: [202.106.184.166] Address: 202.106.184.166> set type = mx> sina.com.cnDefault Server: [202.106.184.166] Address: 202.106.184.166Non-authoritative answer: sina.com .cn mx preference = 10, mail exchanger = sinamx.sina.com.cnsina.com.cn Nameserver = ns1.sina.com.cnsina.com.cn Nameserver = ns3.sina.com.cnsinamx.sina.com.cn Internet address = 202.106.187.179sinamx.sina.com.cn internet address = 202.106.182.230ns1.sina.com.cn internet address = 202.106.184.166ns3.sina.com.cn internet address = 202.108.44.55 to check if a certain domain name The MX record does not exist, then the following remarks appear: c: /> nslookup> set type = mx> Amaxit.com.cndefault Server: [202.106.184.166 *** 202.106.184.166 can ' T Find Amaxit.com.cn: Non-Existent Domain Use your domain name in the mail system to assume your mail server address is: 61.176.1.120 has built a record: mail.mydomain.com A 61.176.1.120
For the case where MX record already exists
If the MX record already exists and has been checked on a domain name server, the job you need to do is to contact your domain name service provider or the administrator of the domain server, and modify the MX record as follows: Your domain name in mx 10 mail.mydomain.com does not exist in MX records
To figure out that your domain is exactly the domain name in which domain name server (DNS) is analyzed, there are two ways to check the relevant application information submitted when you register the domain name, and get the unit, and The unit contact for the acceptance, letting the other person's related personnel will help you find out; the other is in WinNT, Win2000, or various UNIX operating systems, by using NSlookup. Once you have found your domain name server, please contact your domain service provider or the administrator of the server, let the other party add a MX record, the form of the record is as follows: Your domain name in mx 10 mail.mydomain.com
Only if the hostname can build a mail system? absolutely okay. Suppose your mail server's host name is mail.mydomain.com, that is, in the Internet, mail.mydomain.com resolved to your mail server IP address. You can build a domain called mail.mydomain.com in your email system, your email format is user1@mail.mydomain.com, and other mail systems can send trusts to your server, using dynamic domain names to point to the same . If you have a static IP address, you can even build an IP address as the end of the mail system. There is also a case your domain name directly to your mail server, that is, in the internet, mydomain.com resolved to your mail server, then build a mydomain.com domain, your email format is user1@mydomain.com What is the domain name resolution on the dynamic domain name Internet is typically static, that is, the IP address corresponding to one domain name is static, long-term constant. That is, if you want to build a website on the Internet, you need to have a fixed IP address. The function of the dynamic domain name is to achieve a resolution between a fixed domain name to the dynamic IP address. After receiving the new IP address each time, the dynamic domain software installed in the user's computer will send this IP address to the dynamic domain name resolution server, update the domain name resolution database. When other people on the Internet want to access this domain name, the dynamic domain resolution server returns to him the correct IP address. Because the IP address assigned to the Internet is dynamic, use the traditional static domain name parsing method, it is impossible to make a website that has a fixed domain name. And with dynamic domain names, this dream can come true. Users can apply for a domain name, using dynamic domain name resolution services, bind the domain name with your own computer, so you can build your own website at home or in the company, it is very convenient.
Private network IP network segment private address (private address) belongs to the non-funded address, which is specifically used inside the organization. The three types of internal addressing addresses, which are listed below: Class A 10.0.0.0, Class B 172.16.0 - 172.31.0.0, Class C 192.168.0.0 - 192.168.255.0.
How to view my computer IP address Windows system: Use the mouse to select "Start" -> "MS-DOS Mode", open a DOS command line window, execute: ipconfig, Linux: Enter it in the command line Ifconfig
What is a subdomain name, a secondary domain name? The subdomain name is a relative concept, which is relatively parent domain name. The domain name has many levels, and the intermediate is separated. For example, the top-level domain name of the company is ending with COM, all domain names ending with COM are its subdomains. For example: www.amaxit.net is a subdomain of Amaxit.NET, while Amaxit.net is a subdomain of NET.
What is RBL? RBL full name is Real-Time Blackhole Lists, which is a service provided by foreign anti-spam organizations to check spam sender addresses. RBL features are almost unavailable for Chinese users. Because we found that most Chinese IP addresses are in the RBL database. Please do not enable the RBL function. Common RBL server addresses are: translays.ordb.org; dnsbl.njabl.org; bl.spamcop.net; sbl.spamhaus.org; dun.dnsrbl.net; DNSBL.SORBS.NET query and delete IP addresses in RBL Please
http://openrbl.org/ and
Http://ordb.org email symbol @ 来 来 @ 符 符 in English, I have two meaning, "in" or "unit price". Its in the previous meaning is because its pronunciation is similar to English AT, so often used as a synonym of "in". For example, "Wait You @ Schoolmorning" is "Wait You @choolmorning". In addition to the AT, it has the meaning of Each, so "@" is often used to represent the unit price symbol of the product. A computer engineer Tenton in the United States established @ @ in email, giving symbol "@" new ideas. In order to make it easy for users to receive e-mail on the Internet, in 1971, the US Department of Defense Development Military Network Apiten's BBN computer company's Ton Linsen, ordered to find an email address of an electronic mailbox address. He selected this symbol "@" in the name of the name and taking the previous meaning, can simply communicate the information of someone in some place, "@" enters the computer network. The performance format of Tanglinson design is "the nature code two letters expressed by" Name Code Computer Host or Company Code Computer Host Agency ". This is the format of the email address we use, where the username and computer address are separated by "@" symbol, so that the email can be transmitted accurately via the network.
