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I am setting up a handful of servers in a co-location facility behind a pfSense firewall. We've decided for redundancy and high availability concerns to also have a duplicate set of servers in a second location. At both locations I have a single IP address and pfSense firewalls. As my background is in software engineering and not networking, how do I set this up in a way that if one firewall or facility goes off-line the other will take over? We have the ability to get a private ethernet connection between the facilities. The two locations are on different subnets. I hope I've supplied enough information.

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  • You hve multiple way to do that, but it require something else. A way I use to know is a product that control your DNS and when it detect a down it switch the host in the DNS to direct to the correct datacenter (and your DNS name is setupped with a short TTL)
    – yagmoth555
    Feb 1, 2017 at 16:55
  • I've thought about that, and I'm currently checking with our registrar to see if they have a API I could use to make that change. I was looking for some other suggestions.
    – mxtreme311
    Feb 1, 2017 at 17:06
  • or just use round-robin if both datacenter can accept the load
    – yagmoth555
    Feb 1, 2017 at 17:21
  • are you referring to a round-robin DNS?
    – mxtreme311
    Feb 1, 2017 at 18:00

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