AWS Network Firewall limiations

Question

There are hard limits for AWS Network Firewall, namely:
- Maximum stateful rule group capacity. For more information: 30,000
- Maximum number of stateful rule groups per firewall policy: 20

Let's say I want to use AWS Managed Rules and also create my own rules and this is not possible, because AWS is providing 20 rule groups. Each set of managed rule groups counts as a single rule group toward the maximum number of stateful rule groups per firewall policy. So there is no space left for my own rule groups. What is really intereseting, it is not possible to use all of 20 AWS Managed rule groups, because when I try to use it it will exceed 30.000 capacity.

My question is, why these limits are so low?

Answer

You are right regarding trying to manage all stateful managed rule group will hit the 30000 hard limit. You can think rule groups as containers of rule groups, therefore you can group your rule groups by functionality (for example botnet, malware) and type (stateful/stateless) under separate policies which will give you the flexibility: 
- not to hit the limits 
- manage your rule groups and policies easily

AWS Network Firewall limiations

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