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We are using DDoS protection system which works as a proxy or load balancers. Since then all we have in logs are load balancer IP address. Source (real) client IP address is stored in X-Forwarder-for header.
In IIS 8.5 there is option for Enhancing Logging (not Advanced Logging) where we can add X-Forwarder-for header into log files (with my custom column name).
Will be there any option to replace parsing s-ip column with my new custom column with real IP address?