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redundant internet feed and web hosting / DNS

Posted on 2015-01-21
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Hello, I am considering a redundant internet feed for our data center. I understand how a backup internet feed could help provide access to users in the event that our main internet feed goes down. We have web applications and domains that we host that the public need access to.

Is there a technique that would allow our us to configure redundant DNS entries on our Godaddy account for both internet feed WAN IPs if that makes sense.

Thank you
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Question by:Mark B
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giltjr earned 2000 total points
ID: 40563033
You can configure two IP addresses for a single host name. Most modern browsers will try 1st address returned and if that does not respond within 30 seconds, or so, they will try the second address.

However, DNS is not used for this.  The problem is that when one ISP link goes down the DNS server does not know it and will still hand out the "bad" IP address and get "slow" response as described above.

If you have a /24 from your upstream ISP, you could get a ASN  and then work with your ISP's to do BGP and if one link goes down, your IP addresses will be routed through the other IPS's network to you.  That is the normal way to do this.
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by:Mark B
ID: 40564372
Thank you, this was the explanation I have been looking for.
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