How to allow set Host file dns query priorities in BIND

[Kevin Darcy]

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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