We host several applications (some web based some not) from a datacentre, I've been tasked with providing some sort of site failover in the event of an outage, I think i have the backend covered but I'm struggling with connectivity.
Our office and DC are connected by IPSEC, connection bandwidth is good, latency is low. Some customers access web apps over the internet others by VPN, we also have customers accessing the datacentre using RED's. Both sites have a UTM cluster with multiple uplinks.
What is the best method using UTM's to achieve a situation where customers can failover from one site to another?

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