No matter how secure your website is with load balancing and failover, you
still run the risk of your ISP (internet service provider) going offline for
whatever reason.
One solution to that is to have multiple internet connections from multiple
ISPs, so that if one ISP goes out, you still have a good chance of the next ISP
staying online.
But using regular DNS, this will not work very well, because the DNS server
will not be notified that one of the ISPs has been disconnected, and so the DNS
server will keep sending browsers to the off line internet cable.
OctaGate DNS with failover
If you're running OctaGate DNS, it will automatically detect the broken
internet connection, and it will stop sending DNS responses with any IP numbers
on that connection. Meaning that only the servers on the still functioning
server will be included in DNS responses.
Note that for this to work, the
OctaGate DNS server must be placed outside of the network, otherwise it
will not be able to detect that an internet connection has stopped functioning.
For maximum security, you should have multiple DNS servers located at multiple
external locations.
