Hello karthicit06,
You can enable the Include Public DNS Servers by navigating to that WAN’s settings, locate the HealthCheck information, and you’ll just need to tick the Include Public DNS Servers checkbox under the Health Check DNS Servers section.
To use bonding with SpeedFusion you’ll need to have another Balance/MAX router or FusionHub setup in another location - AWS, MS Azure, Google Cloud, or another location using something like ESXi/vSphere. If you are interested in FusionHub, we have a few guides for setting up FusionHub on AWS, Azure, and Google Cloud here: