Question 1
Q: What is "interface to network mappings" in SmartDNS?
SmartDNS allows hosts on a network to have multiple IP addresses associated with them from different providers, and will hand out the IP addresses for these hosts using the interface-to-network mappings.  Interface-To-Network Mappings are necessary for SmartDNS to function properly. The mappings are used to specify the network(s) that belong to each interface. This will tell SmartDNS which IPs belongs to which interface when answering DNS queries. The mappings are also used with Site Load Balancing to specify which networks belong to each interface of each site.

Question 2
Q: Where is the “interface to network mapping” section located in the GUI?
A: Within the GUI, under the menu, select Load Balancing/SmartDNS.  Within SmartDNS you can then select “Advanced”.  You can now edit the interface to network mappings section.

Question 3
Q: What other parameters are defined in interface to network mappings?
A: A number of items can be addressed.  Choose a Role for this Interface from the Select a Role dropdown menu. "Primary"’ specifies that IPs associated with this WAN Interface will be handed out in a DNS request as long as the link is up. "Backup" specifies that IPs associated with this link will be handed out in a DNS request only if all primary links are down (unavailable). "Weight" affects how often IPs from this particular mapping is handed out in DNS requests. The number entered is the number of times an IP will be handed out before using the next mapping. If all mappings have a weight of one, then they are all treated equal and IPs are handed out in a round-robin
fashion.