bind configuration issues

Chuck Swiger cswiger at
Mon Oct 26 17:51:09 UTC 2009

On Oct 26, 2009, at 10:03 AM, Ray Still wrote:
> Hello,
> I am adding a redundant Internet connection to my current hosting  
> setup and
> I need to figure out how to set up the DNS to make this work.

The two issues normally aren't related.

If both connections are from the same provider, talk to them about  
multilink PPP; if they are from different providers, you need to look  
into multihoming and getting your own AS #.

> Current setup:
> freebsd 7.0 machine, one local IP address, runs web, mail, and name  
> server.
> static ip address in router.
> I have two DNS servers registered, but they both point to the same ip
> address an the same machine. (Yes, I should have my fingers slapped.)
> Desired setup
> same machine, one local IP address, runs web, mail, and name server.
> different router (Linksys RV082) with 2 static ip address.

In order to have redundancy, you need to have two real, separate  
machines, each of which is running BIND, each of which is on a  
separate routable IP.  This is an orthogonal issue to setting up  
multiple Internet connections.

> How do I set up bind so that
> 1) bandwidth is shared between the two connections,
> and
> 2) if one goes down, the other keeps working.
> I had a few ideas, but they all seem to have flaws.

You can't set up BIND to control multilink aggregation and failover;  
that's not what it does.


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