Constraints

Public zone

50

Submit a service ticket.

Private zone

50

Submit a service ticket.

Record set

500

Submit a service ticket.

PTR record

50

Submit a service ticket.

Custom line

50

Submit a service ticket.

Inbound endpoint

50

Submit a service ticket.

Outbound endpoint

50

Submit a service ticket.

Endpoint rule

50

Submit a service ticket.

Maximum number of IP addresses that can be bound to an endpoint

6

Submit a service ticket to increase the quota.

Maximum number of VPCs that can be associated with a private zone

No limit

-

Maximum number of VPCs that can be associated with an endpoint rule

No limit

-

Maximum number of requests for a single ECS in a VPC

2,000 per second

For a single ECS in a VPC, the maximum number of resolution requests is 2,000 per second. If the number of requests exceeds this, extra requests may not be handled.

To avoid this, enable DNS caching to improve lookup efficiency.

Total number of requests for all ECSs in a VPC

No limit

-

Maximum number of recursive resolution requests for a single ECS in a VPC

600 per second

For a single ECS in a VPC, the maximum number of external recursive requests is 600 per second. If the number of requests exceeds this, extra requests may not be handled. If your VM requests a swarm of random subdomain names, DNS resolution will be frozen.

If your services initiate an enormous volume of concurrent requests, enable DNS caching to improve lookup efficiency.

Total number of recursive requests for all ECSs in a VPC

5,000 per second

For all ECSs in a VPC, the maximum number of external recursive requests is 5,000 per second. If the number of requests exceeds this, extra requests may not be handled.

If access to a large number of Internet domain names is required, some domain names may not be accessible due to traffic limiting. To avoid this, submit a service ticket.

Maximum number of recursive resolution requests for a single domain name in a VPC

50 requests per second

For a single domain name (for example, example.com) and its subdomains in a VPC, the maximum number of external recursive requests is 50 per second. If the number of requests exceeds this, extra requests may not be handled.

Bandwidth for handling requests to a public zone

5 Gbit/s

If your public domain name has abnormal requests evaluated by Huawei, such as attacks, and more than 5 Gbit/s of bandwidth is required for handling the requests, the domain name may be blocked. To address this issue, you should select an appropriate security protection product.

Maximum number of requests to a single IP address configured for an inbound endpoint

10,000 requests per second

Up to 10,000 requests can be routed to a single endpoint IP address per second, and up to 600 external recursive requests can be routed to a public domain name per second. If the number of requests exceeds these limits, extra requests may not be handled.

To avoid this, enable DNS caching for your on-premises network to improve lookup efficiency.

Maximum number of requests from a single IP address configured for an outbound endpoint

10,000 requests per second