The option is activated by configuration parameter in /etc/dpi/fastdpi.conf:

ntf_server=192.168.0.18/ntf

Here 192.168.0.18/ntf - is the name or the address of the server1) In case this parameter ends by ? or &: the parameter UrlRedir is added to the formed URL. It points to a page selected by a subscriber. that hosts information page.

You can include a part of the path into the address. It allows using the same server for several services.