Issue with Forwarding(URGENT!!!)

[Sten Carlsen]

Joseph S D Yao wrote:
>On Tue, Jun 22, 2004 at 12:21:45AM -0600, Sanjib Sanjib wrote:
>  
>
>>Hi ,
>>
>>I have some problem in forwarding feature of bind 9.2 based DNS server.
>>The configuration  done in my DNS server , which is BIND 9.2 is
>>mentioned below 
>>
>>options{
>>
>>recursion true;
>>allow-recursion {any;};
>>forward first;
>>forwarders {x.x.x.x; y.y.y.y;};
>>}
>>
>>Details of server version in the forwarder list:
>>x.x.x.x is Solaris (Bind 8.2) and y.y.y.y is( BIND 9.2) server.
>>
>>The problem is in query forwarding for some off site records . When
>>ever you try to query any record which is not present in the
>>authoritative data of my DNS server , it forwards to the DNS server in
>>the forwarder list mentioned above. Now my problem is , whenever my 1st
>>server(i.e. BIND 8.2) not able to respond the query for whatever reason
>>, queries are not getting forwarded to the other server in the list .But
>>if I reverse list in forwarder option is works fine for me. Is there any
>>compatibility issue here???
>>I just want to know how exactly it works in BIND 9.2 ? It works in
>>round robin manner or from left to right ??
>>Can any body suggest me , where is the problem ??? I am interested to
>>know the implementation logic of forwarding in BIND 9.2. source code. 
>>Since it's very urgent , I will appreciate your early response.
>>Thanks in advance,
>>Sanjib
>>    
>>
>
>Lists almost always mean to select ONE and ask it.  In fact, unless a
>server completely fails to respond, I can't think of ANY lists in BIND
>where servers are queried serially until you find the answer you like.
>  
>
While it is not exactly BIND, the resolver (from ISC) does query all 
available nameservers to find one that does answer (as far as I know) 
the answer could then be that there is no answer. This might confuse 
this discussion: the difference between
no answer from server
and
the answer that there is no answer.

>Remember, that a "no answer available" answer is a valid answer.
>Especially for a non-existent domain name.  Your server is forwarding
>the query to the closest name server that is alive, and returning its
>answer.  This is the correct operation for your configuration.
>
>  
>


-- 
Best regards

Sten Carlsen

No improvements come from shouting:

       "MALE BOVINE MANURE!!!"