Help Center/ Cloud Firewall/ Service Overview/ Constraints
Updated on 2025-07-23 GMT+08:00
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Constraints

This topic describes some limitations and constraints on using CFW.

CFW Usage Restrictions

  • Only the services deployed on Huawei Cloud can be protected. Cross-cloud access is not supported.
  • Traffic protection supports EIPs, but does not support global EIPs or the EIPs bound to API Gateway.
  • CFW can be used only in the region where it was purchased. To use it in another region, switch to that region and purchase it. For details about the regions where CFW is available, see Function Overview.

Protection Policy Quota Limit

  • A maximum of 20,000 protection policies (protection rules and blacklist/whitelist rules) can be added to a firewall instance. The limits on the blacklist/whitelist rules are as follows:
    • A maximum of 2,000 blacklist items can be added to a firewall instance.
    • A maximum of 2,000 whitelist items can be added to a firewall instance.
  • The restrictions on protection rule references are as follows:
    • A maximum of 20 source IP addresses and 20 destination IP addresses can be added.
    • A maximum of two source IP address groups and two destination IP address groups can be associated.
    • A maximum of five service groups can be associated.
  • Groups
    • IP address groups
      • A firewall instance can have up to 3,800 IP address groups.
      • An IP address group can contain up to 640 IP addresses. A maximum of 100 IP addresses can be added to an IP address group at a time.
      • A firewall instance can contain up to 30,000 IP addresses.
    • Service groups
      • A firewall instance can have up to 900 services.
      • A firewall instance can have up to 512 service groups.
      • A service group can have up to 64 services.
    • Domain name groups
      • The domain names in a domain name group can be referenced by protection rules for up to 40,000 times. Wildcard domain names (for example, *.example.com) can be referenced for up to 2,000 times.
      • Application domain name group (layer 7 protocol parsing)
        • A firewall instance can have up to 500 domain name groups.
        • A firewall instance can have up to 2,500 domain names.
        • An application domain name group can contain up to 1,500 domain names. Up to 500 domain names can be added at a time.
      • Network domain name group (layer 4 protocol parsing)
        • A firewall instance can have up to 1,000 domain names.
        • A network domain name group can have up to 15 domain names.
        • Each domain name group can resolve up to 1,500 IP addresses.
        • Each domain name can resolve up to 1,000 IP addresses.

Restrictions on Basic IPS

  • Modifying the action of a basic protection rule
    • The actions of up to 3000 rules can be manually changed to observation.
    • The actions of up to 3000 rules can be manually changed to interception.
    • The actions of up to 128 rules can be manually changed to disabling.
  • Custom IPS signature
    • Only the professional edition supports custom IPS signatures.
    • A maximum of 500 features can be added.

Restrictions on Logs

  • CFW allows you to view the logs generated within the last seven days. If you need to record and view logs generated within the last 1 to 365 days, you can record one or multiple types of logs in LTS.
  • Up to 100,000 records can be exported for a single log at a time.