Load balancing with single Domain name
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I have we common scenario such as i have two different ISPs both are on same pfsense and one server is behind the LAN, Load balancing is done .
ISP1------> pfsense ------> LAN (server) ISP2------>
I have single domain name which is pointed to both WANs. But I am confused and unable to understand that like google.com, facebook.com both has single IP against domain name. How can I do the load balancing of DNS so that when i ping domain or check up from nslookup it shows only one IP and one wan goes down other should be enable.
Looking for help. Thanks