Function Plan |
Anti-DDoS Pro and Anti-DDoS Premium instances |
The function plan of the Anti-DDoS Pro or Anti-DDoS Premium instance that you want
to use. Valid values: Standard Function and Enhanced Function.
You can move the pointer over the  icon next to Function Plan to view the differences between the Standard and Enhanced function plans. The following
figure shows the differences. 
|
Instance |
Anti-DDoS Pro and Anti-DDoS Premium instances |
The Anti-DDoS Pro or Anti-DDoS Premium instance that you want to use. You can associate
a maximum of eight instances with a domain name. The instances associated with the
domain name must use the same function plan.
Available instances are displayed after you configure Function Plan. If no instances are displayed, no instances use the function plan that you select.
In this case, you can purchase an instance or upgrade the Standard function plan to
the Enhanced function plan. For more information, see Upgrade an instance.
|
Domain |
Anti-DDoS Pro and Anti-DDoS Premium instances |
The domain name of the website that you want to protect. The domain name must meet
the following requirements:
- The domain name can contain letters, digits, and hyphens (-). The domain name must
start with a letter or a digit.
- The domain name can be a wildcard domain name, such as
*.aliyundoc.com . If you enter a wildcard domain name, Anti-DDoS Pro or Anti-DDoS Premium automatically
matches all subdomains of the wildcard domain name.
- If you configure a wildcard domain name and an exact-match domain name, the forwarding
rules and mitigation policies of the exact-match domain name take precedence. For
example, if you configure
*.aliyundoc.com and www.aliyundoc.com , the forwarding rules and mitigation policies of www.aliyundoc.com take precedence.
|
Protocol |
Anti-DDoS Pro and Anti-DDoS Premium instances |
The type of the protocol that the website uses. Valid values:
- HTTP
- HTTPS: If the website uses HTTPS, select HTTPS and upload an SSL certificate file after you save the website configurations. For
more information, see Upload an HTTPS certificate.
- Websocket: If you select Websocket, HTTP is automatically selected. You cannot select only Websocket for the Protocol parameter.
- Websockets: If you select Websockets, HTTPS is automatically selected. You cannot select only Websockets for the Protocol parameter.
If you select HTTPS, you can click Advanced Settings to configure the following options. 
- Enable HTTPS Routing: If the website supports both HTTP and HTTPS, this feature is available. If you enable
this feature, all HTTP requests to access the website are redirected to HTTPS requests
on the standard port 443.
Notice
- This feature is available only when both HTTP and HTTPS are selected and Websocket is cleared.
- If you access the website over HTTP on a non-standard port and enable this feature,
all HTTP requests are redirected to HTTPS requests on the standard port 443.
- Enable HTTP: If the website does not support HTTPS, this feature is available. If this feature
is enabled, all HTTPS requests are redirected to HTTP requests and forwarded to origin
servers, and all WebSockets requests are redirected to WebSocket requests and forwarded
to origin servers. By default, the requests are redirected over the standard port
80.
Notice
- If the website does not support HTTPS, turn on Enable HTTP.
- If you access the website over HTTPS on a non-standard port and enable this feature,
all HTTPS requests are redirected to HTTP requests on the standard port 80.
- Enable HTTP2: After you turn on Enable HTTP/2, HTTP/2 is used.
|
Enable OCSP |
Anti-DDoS Pro and Anti-DDoS Premium instances |
Specifies whether to enable the Online Certificate Status Protocol (OCSP) feature.
Notice This feature is available only for a website that supports HTTPS. If HTTPS is selected for Protocol, we recommend that you enable this feature.
OCSP is an Internet protocol that is used by a Certificate Authority (CA) to check
the revocation status of a certificate. When a client initiates a Transport Layer
Security (TLS) handshake with a server, the client must obtain the certificate and
an OCSP response.
The OCSP feature is disabled by default. In this case, OCSP queries are sent from
a browser that the client uses to a CA. Before the client obtains an OCSP response,
subsequent events are blocked. If transient connections or network disconnections
occur, a blank page is displayed for a long period of time, and the performance of
the website that supports HTTPS is compromised.
If the OCSP feature is enabled, Anti-DDoS Pro or Anti-DDoS Premium executes OCSP queries
and caches the query results for 300 seconds. When a client initiates a TLS handshake
with the server, Anti-DDoS Pro or Anti-DDoS Premium returns the OCSP details and the
certificate chain to the client. This prevents blocking issues caused by OCSP queries
from the client. OCSP does not cause security risks because OCSP responses cannot
be forged.
|
Server IP |
Anti-DDoS Pro and Anti-DDoS Premium instances |
The address type of the origin server. You must enter the address of the origin server.
Valid values:
- Origin Server IP: the IP address of the origin server. You can enter a maximum of 20 IP addresses.
If you enter more than one IP address, separate them with commas (,).
- If the origin server is hosted on an Elastic Compute Service (ECS) instance, enter
the public IP address of the ECS instance. If the ECS instance is associated with
a Server Load Balancer (SLB) instance, enter the public IP address of the SLB instance.
- If the origin server is deployed in data centers or on other clouds, you can run the
ping Domain name command to query the public IP address to which the domain name is resolved and enter
the public IP address.
- Origin Server Domain: the domain name of the origin server. Select this option when you deploy a proxy
service, such as Web Application Firewall (WAF), between the origin server and Anti-DDoS
Pro or Anti-DDoS Premium. You must also enter the address of the proxy, such as a
CNAME. You can enter a maximum of 10 domain names. If you enter more than one domain
name, separate them with line breaks.
If you want to use Anti-DDoS Pro or Anti-DDoS Premium together with WAF, select Origin Server Domain and enter the CNAME that WAF assigns. This provides enhanced protection for the website.
For more information, see Add a website to both Anti-DDoS Pro or Anti-DDoS Premium and WAF.
Notice If you enter the default public endpoint of an Object Storage Service (OSS) bucket
for Origin Server Domain, a custom domain name must be mapped to the bucket. For more information, see Regions and endpoints and Map custom domain names.
If you enter more than one IP address or domain name, Anti-DDoS Pro or Anti-DDoS Premium
uses IP hash to forward website traffic to the origin servers. After you save the
website configurations, you can change the load balancing algorithm. For more information,
see Modify the back-to-origin settings for a website.
|
Server Port |
Anti-DDoS Pro and Anti-DDoS Premium instances |
The server port that you specify based on the value of Protocol.
If you select HTTP, the default port 80 is used. If you select HTTPS, the default port 443 is used.
Notice
- The port for Websocket is the same as the port for HTTP.
- The port for Websockets and HTTP/2 is the same as the port for HTTPS.
You can click Custom to the right of the Server Port parameter to specify one or more custom ports. You
can specify multiple custom HTTP or HTTPS ports. If you specify multiple custom ports, separate the ports with commas (,).
 Take note of the following limits when you specify custom ports:
- The custom ports that you want to specify must be supported by Anti-DDoS Pro or Anti-DDoS
Premium. You can click View optional range to view the HTTP and HTTPS ports that are supported.
The ports that are supported vary based on the function plan of your Anti-DDoS Pro or Anti-DDoS Premium instance.
- Anti-DDoS Pro or Anti-DDoS Premium instance of the Standard function plan:
- HTTP ports: ports 80 and 8080
- HTTPS ports: ports 443 and 8443
- Anti-DDoS Pro or Anti-DDoS Premium instance of the Enhanced function plan:
- HTTP ports: ports that range from 80 to 65535
- HTTPS ports: ports that range from 80 to 65535
- You can specify up to 10 custom ports for all websites that are added to your Anti-DDoS
Pro or Anti-DDoS Premium instance. The custom ports include HTTP ports and HTTPS ports.
For example, you want to add Website A and Website B to your Anti-DDoS Pro or Anti-DDoS
Premium instance, Website A provides services over HTTP ports, and Website B provides
services over HTTPS ports.
If you specify HTTP ports 80 and 8080 for Website A, you can specify up to eight HTTPS
ports for Website B.
|
Cname Reuse |
Anti-DDoS Premium |
Specifies whether to enable CNAME reuse.
If more than one website is hosted on the same server, this feature is available.
After CNAME reuse is enabled, you need only to map the domain names hosted on the
same server to the CNAME that is assigned by Anti-DDoS Premium. For more information,
see Use the CNAME reuse feature.
|