ANNOUNCEMENT! (Lost Registered SUBDOMAINS: 9-24 Jan 2008) BECAUSE OF THE SERVER PROBLEM LAST WEEK, WE LOST THE SUBDOMAIN DATABASE. WE ARE SORRY FOR THIS. NOW, WE USE THE LAST BACKUP DATABASE. SO, IF YOUR REGISTERED SUBDOMAIN ISN'T WORK, PLEASE REGISTER AGAIN. THANK YOU!
DNS Explanation - FAQ
A Record - MX Record - CNAME Record - TTL - Domain Resolving
Term Explanation: Domain Resolving; A Record; MX Record; CNAME Record; TTL
What is domain resolving?
Domain resolving is actually the converting process of tying text-based domain names to
the numeric IP Addresses that are necessary to locate the domain name's server on the net.
For the convenience of memory, IP addresses are replaced by domain names to identify the websites.
The resolving of domains is done by DNS servers.
What is A record?
A (Address) record is the corresponding IP address used to specify hostname (or domain name).
You can point the website servers under your appropriate domain to your own web servers and
setup sub-domains for your domains at the same time.
What is MX record?
MX record is the mail exchange record. You may point your mail server under your appropriate
domain names to your own mail server, and manage all the mail settings by yourself.
Just fill in the IP address of your server online, it will help you forward all the emails
under your appropriate domain name to your own mail server.
What is CNAME Record?
CNAME is canonical name record. Such record allows you to map more than one name to
the same computer and it is generally applying to the computers offering web and email
services on the same one. For example, there is a computer named 'host.mydomain.com'
(A record) offering both www and mail services. For the users' convenience to access
the websites, you can give two CNAME to the computer: www and mail.
The full names of these two aliases are www.mydomain.com and mail.mydomain.com,
actually both of them are pointing to host.mydomain.com.
What is the TTL?
The full name of TTL is "Time To live". In short, it refers to the keeping time of DNS record at DNS server.
Below is an example to explain what is TTL's value.
Supposing there is a domain myhost.abc.com
(Actually this is a DNS record, it generally means that there is a host computer called myhost in the domain abc.com).
its corresponding IP address is 1.1.1.1, and its TTL is 10 minutes.
This domain or this record is kept in a DNS server called dns.abc.com.
Now if an user inputs the following address (or URL): http://myhost.abc.com, what will happen next?
The DNS server 8.8.8.8 appointed by the user (or the DNS assigned automatically by his ISP, network provider)
will try to explain him myhost.abc.com, surely the DNS server 8.8.8.8 can't resolve right away
since it doesn't include the records of myhost.abc.com. But through the recursive search of DNS in the world,
it finally goes to the server dns.abc.com.
The DNS server dns.abc.com informs the DNS server 8.8.8.8 the corresponding IP address of myhost.abc.com,
and then 8.8.8.8 informs the user of the result.
To speed up the resolving of this record, 8.8.8.8 will keep the result 1.1.1.1 for a period of time,
that is called TTL time. In this period, if the user requests to resolve myhost.abc.com again,
8.8.8.8 will tell the user directly. While if the TTL time is outdated, the whole process will be repeated.
The domain name's DNS is not configured to the correct DNS as requested.
Please make sure that the DNS are ns1.your.com and ns2.your.com and ns3.your.com and ns4.your.com,
or the IP addresses of the DNS are the same as ns1.your.com or/and ns2.your.com or /and ns3.your.com or/and ns4.your.com.
Please check whether your MX record is setup correctly;
Please check to see if your mail server is setup correctly.
You may try our mail forwarding service if you don't own an email server.
Why hasn't the MX record taken effect?
Most of SMTP requires MX record to be pointed to a hostname instead of IP address.
For example, if you would like to setup 218.5.1.249 as the mail server of whatis.cn, you can configure in this way,
Resolve mail.whatis.cn to 218.5.1.249
(please fill in mail for host column, and choose A for type column,
then fill in 218.5.1.249 for data column, click 'Add' button).
Please configure the MX record of whatis.cn as mail
(leave host column, choose MX for type column,
fill in mail for data column and then click 'Add' button.)
Configurate your email server at 218.5.1.249 to accept emails for @whatis.cn.
If you fill in mail for host column in the second step,
then all the emails sent to @mail.whatis.cn (not @whatis.cn) will be received by 218.5.1.249.
This may not meet with your original intention.
Our #1 Security Tip:
Use Firefox instead of Internet Explorer and PREVENT Spyware! Firefox is free and is considered the best free, safe web browser available today.
