Re: How do I : one static DNS , one from DHCP ?

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On 12/8/18 5:53 PM, Samuel Sieb wrote:
On 12/8/18 8:23 AM, sean darcy wrote:
I'm running a DNS server (unbound) on a VOIP server. It's crucial that I can always resolve addresses, even if it's slower. Now DNS1 is set to 127.0.0.1, peerdns no. Giving:

How does the local DNS do the resolving.  Why is it slower?

What I want is:

nameserver  127.0.0.1
nameserver  <whatever dhcp gives>

This will not work the way you are expecting.  Resolving will always go to the first one unless it doesn't respond.  In that case it will go to the second one, but that will be slow because every request has to timeout on the first one before that.

My local server - unbound - works great. Never a problem, almost. Sometimes there's a problem on reboot, and unbound doesn't start. For that very rare event, I'd like a backup - even if it's very slow. The VOIP server - asterisk - will shut down if it can't resolve ip addresses within 4 or 5 minutes. And then I have a real problem.

I'd like to avoid a single point of failure, even if unlikely.

sean
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