How to allow set Host file dns query priorities in BIND

Kevin Darcy kcd at
Wed Feb 23 17:29:39 UTC 2011

On 2/23/2011 4:08 AM, babu dheen wrote:
> Hi,
>  Our setup is; We have internal DNS server wherein BIND is configured 
> in RHEL 5 and many internal zones are configured. if Internet 
> connection is down, our Internal DNS severs are not able to get the 
> DNS query from ISP DNS server. Because of this, all users are not able 
> to access many critical application hosted in internet.
>  Now we would like to add those critical applicaton DNS entries in our 
> internal DNS server HOST file. So that if internet link is down, users 
> will be able to get the IP address of the URL through host file.
If the names of these "critical applications" reside in zones that you 
own, you should probably set yourself up as a stealth slave for those 
zones. If they're in someone else's zones, and being a stealth slave is 
impractical, then you could play a dangerous game by maintaining a 
"fake" version of the zone yourself (defined as "master"). Dangerous 
because the IPs could change without any notice and then your data is 
instantly invalid. But, I suppose that isn't any worse than hosts-file 
entries, right?
> is there any option in BIND to give priority to HOST file before 
> connecting it to internet ISP or local zone?
Nope, BIND doesn't control whether a process looks in the hosts file or not.

                                                                 - Kevin
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