March 3, 2006
域名的基本概念
服务提供
注册、使用一个域名，就是域名服务的获得过程，应该分成两部分看。一是域名注册，二是域名（解析）服务。
注册，管理
域名注册确定了你对域名的拥有权。注册商(registrar)在ICANN获得授权，你在注册商那里注册、续费。
A registrar is an organization that has been accredited by ICANN to register domain names. Yahoo!’s domain registration partner, Melbourne IT, is the registrar for all new domains registered through Yahoo!
域名服务器
域名服务器，为你的域名提供解析。包括的功能很多，比如子域名解析、MX段解析等。
A name server, DNS server is similar to a telephone switchboard. It holds the information that tells the Internet where to find your web site and where to deliver your email. Name servers look something like this: yns1.yahoo.com. You can change your name servers in the Advanced DNS area of your Domain Control Panel; however, Yahoo!’s name servers must be listed as the primary and secondary name servers in order for Yahoo! to host your domain services properly.
从 www.internic.net/whois.html 查询，可以确定域名的DNS Server。
域名转移(registrar transfer) 和 更改域名指向（Domain Forwarding）不同
A registrar transfer is the movement of a domain name’s records and management from one registrar to another. When you transfer your domain to a different registrar, the new registrar becomes responsible for maintaining your domain registration records, managing your domain renewals, and other administrative details.
购买虚拟主机时（比如StartLogic），只要point the dns servers to StartLogic from your current registrar就可以了。这一般不收费。
registrar一般都提供Web形式的操作面板，可以用来设置DNS server。最次也可以打电话要求手动更改。
DNS的一些基础知识
A host name is an Internet address or domain name with a prefix. For example, a host name of the domain name yourdomainname.com may be "example.yourdomainname.com."
An A (address) record is a DNS record that can be used to point your domain name and host names to a static IP address.
The DNS (Domain Name System) records control the functionality of domain names. Each registered domain name has a DNS record that includes MX, A, and CNAME records and name servers.
每一条DNS记录包含MX, A, CNAME 或名称服务器地址等记录。记录的内容是主机名到地址的映射关系。
DNS是有缓存的。 1)访问者的电脑；2)你的ISP接入商。
Filed by
charlie
at 2:16 pm under webdev
