This topic introduces the terms that are related to extra domain packages in Web Application Firewall (WAF).
Default number of domain names protected by WAF
By default, a WAF instance can protect one second-level domain and nine subdomains of the second-level domain. The nine subdomains can be wildcard domains. For example, you can add one second-level domain, such as
example.com, and up to nine subdomains, such as
Extra domain package
If the number of domain names that you want to protect is greater than the default number of domain names that can be protected by WAF, you must purchase an extra domain package. If you do not purchase the extra domain package, some of your domain names cannot be protected by WAF. For example, you add the second-level domain
example.com and its subdomains to WAF, but you do not purchase an extra domain package. In this case, if you add another second-level domain, such as
aliyun.com, or subdomains of this second-level domain to WAF, the following message is sent to you: The number of second-level domains reaches the upper limit. Upgrade WAF or purchase an extra domain package to increase the quota.