Dynamic IP Restrictions
Limit Same-IP concurrent access
Specify the total number of concurrent requests that the website can accept from a specific IP address.
Limit access during time period
Specify the total number of requests that the website can accept from a specific IP address in a given timeframe. Once that timeframe expires the requests counter is reset.
Enable logging-only mode
In Logging Only Mode, Dynamic IP Restrictions runs its normal logic but does not reject any requests. Instead of rejecting requests, it will return the normal response and include in the log the status code for one of the above options to indicate what it would have done in normal mode. With this feature, you can test out settings without actually interrupting your traffic.
- 501 - Dynamic IP Restrictions rejected the request due to too many concurrent requests
- 502 - Dynamic IP Restrictions rejected the request due to too many requests over time
The Dynamic IP Restrictions feature is built-in starting with IIS version 8.0. It can also be installed for IIS 7.0 as an add-on.