Yes you can create inbound NATs on both circuits. https://documentation.meraki.com/MX/NAT_and_Port_Forwarding/Port_Forwarding_and_NAT_Rules_on_the_MX As well as the option mentioned by @Nash , you could also use a DNS service like Amazon AWS Route 53 which lets you configure health checks and perform automatic DNS failover. https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/dns-failover.html
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