This configuration activates/disables the range request detection on the CDN. This allows Streamroot DNA to ask your CDN servers is they have range request activated. If it is not the case, range request won't be used by Streamroot DNA.
In some cases, CDN servers can return false-positives and therefore affect P2P efficiency.
To learn more about range requests and learn how to activate them, please see the articles here.
By default, it is set to ON in the "default" property.