Query regarding NS record

[babu dheen]

Hi,
  Once i delegated NS record in my ISP name server to my company name server for mail.myoffice.com website as below. Do i need to allow DNS port from ANY(INTERNET) to my DNS server in firewall or i just need to allow DNS traffic only from ISP DNS server
 
ISP DNS server configuration
 
mycompany-dns-server-ip   IN    A 10.10.10.10
mail.myoffice.com               IN    NS    <mycompany dns server ip>
 
 
Regards
Papdheen M

From: Kevin Darcy <kcd at chrysler.com>
To: bind-users at lists.isc.org
Sent: Sunday, 18 September 2011 5:09 PM
Subject: Re: Query regarding NS record


  Are you talking about recursive clients failing over?

Or other nameservers trying to talk to yours, non-recursively?

Recursive clients don't use NS records at all and you need to
    approach the failover problem in a completely different way (e.g.
    relying on the client failing over from one resolver IP address to
    another, or implementing an Anycast solution).

If you're talking about nameserver-to-nameserver traffic, then just
    publish multiple NS records for the relevant zone(s) and the
    nameserver-selection algorithm embedded in every known
    iterative-resolver implementation will take care of the
    load-balancing and failover; to summarize, faster-responding
    nameservers will be chosen over slower-responding ones.

                                                                   
                                                                       
                                                - Kevin

On 9/16/2011 11:17 AM, babu dheen wrote: 
Hi, 
>    Can anyone let me know how i can resolve the below requirement. 
>
>
>Requirement: 
>
>We have two offices. One is main office and another one is remote branch office. Now my company client requirement is that if main office DNS server is not reachable, all DNS query should be sent to branch office DNS server. How this can be acheived using BIND? 
>
>For example, my company mail website is; mail.mycompany.com which is pointed as below in ISP name server. 
>
>mail.mycompany.com        IN    NS    ns1.mainoffice.com 
>mail.mycompany.com        IN    NS    ns1.branceoffice.com 
>  
>  Is the above record is correct or not? 
>  
> Please suggest. 
>  
>Regards 
>papdheen M 
>  
>  
>   
>   
>
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