FAQ

Why Do I Get Request Timed Out When Trying to Ping an Acceleration Domain Name?

For security purposes, ping operations are not allowed. You can run the nslookup command to check whether CDN has taken effect. For details, see Checking Whether the CNAME Record Has Taken Effect.

What Are the Differences Between an Acceleration Domain Name and an Origin Domain?

• Acceleration domain names are provided by you for CDN acceleration. A domain name is an identification string that defines a realm of administrative autonomy, authority, or control within the Internet, such as a website, an email address, or an FTP server.
• An origin domain is the domain name of your origin server.

Can Multiple Acceleration Domain Names Use the Same Origin Server IP Address?

Yes. Different acceleration domain names can use the same origin IP address.

Can an Origin Domain Name Be the Same as an Acceleration Domain Name?

No.

When a user requests content on an acceleration domain name, if the desired content is not cached on CDN PoPs, CDN PoPs need to pull content from the origin server. If the origin domain is the same as the acceleration domain name, the user's request will be repeatedly directed to CDN PoPs, and CDN PoPs will not be able to pull content from the origin server.

Can Wildcards Be Used as Part of an Acceleration Domain Name?

Yes. A wildcard, *, allows multiple level-2 domain names to be included by the same value. All these secondary domain names point to the same IP address. If you add *.test.com to CDN as an acceleration domain name and have it resolved to the CNAME provided by CDN, all of the level-2 domain names under *.test.com, such as a.test.com, will enjoy CDN acceleration by default. However, level-3 domain names (such as b.a.test.com) would not.

The following are the rules for adding wildcards to domain names:

• If you add a wildcard domain name to a particular account, you cannot add any of the level-2 domain names under that domain name to other accounts.
• You will be billed for the acceleration service provided to all of the level-2 domain names under a wildcard domain name. If there are multiple level-2 domain names, billing will be based on the traffic generated by the wildcard domain name, not on each of the level-2 domain names.