Enabling traffic filtering in Cloudflare

Detailed information on how Cloudflare works can be found at official documentation of this service.
  1. Connect domain to Cloudflare.
  2. Open the section "Overview":
  3. Turn on the mode "Under Attack Mode" (enable this mode only if you really need to filter traffic):Pressing the switch again will allow you to select the appropriate filtering level.

Additionally, you can make changes to the DNS records of the domain or enable/disable filtering of certain records in the section "DNS":