Azure front door waf rate limiting algorithm

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Azure Application Gateway WAF uses a sliding window rate limiting algorithm, allowing requests up to a defined threshold within a rolling time frame—useful for mitigating DoS attacks regionally. In contrast, Azure Front Door WAF uses a fixed window approach, where requests are counted within a static interval , and excess traffic is blocked until the window resets. App Gateway supports more granular grouping, while Front Door typically limits by IP at a global edge level. Both offer protection against high-volume traffic but differ in scope, algorithm behavior, and enforcement precision.

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