Re: recursion and forwarding

2012-01-12 Thread Kevin Darcy 
You're getting caught up in semantics. The forwarding of the query *is* 
recursive resolution. It's not a separate operation.




- Kevin

On 1/12/2012 1:15 PM, Adamiec, Lawrence wrote:


Hi,

I am running one master server and one slave server with BIND 
9.6.1-P3.  The global options section on both servers are identical.


In the options section I have,

allow-recursion { ck_domain; };

forwarders { 216.47.128.11; 216.47.128.12; 216.47.143.90; };

The ck_domain ACL contains internal IPs only.

The documentation I have read states that forwarders will forward a 
client's query if the answer is not in the server's cache and the 
server does not know the answer.


So when does recursion occur, before the query is forwarded or never?  
I thought recursion was supposed to go looking for the answers.  If 
recursion does not return an answer then does the query get forwarded?


Larry Adamiec

UNIX Mgr.

312-906-5301


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RE: recursion and forwarding

2012-01-12 Thread Adamiec, Lawrence 
This is a very good explanation.  Thank you for your help.

Larry


 -Original Message-
 From: bind-users-bounces+ladamiec=kentlaw@lists.isc.org
[mailto:bind-users-
 bounces+ladamiec=kentlaw@lists.isc.org] On Behalf Of Phil Mayers
 Sent: Thursday, January 12, 2012 12:35
 To: bind-users@lists.isc.org
 Subject: Re: recursion and forwarding
 
 On 01/12/2012 06:15 PM, Adamiec, Lawrence wrote:
 
  So when does recursion occur, before the query is forwarded or
never? I
  thought recursion was supposed to go looking for the answers. If
  recursion does not return an answer then does the query get
forwarded?
 
 forwarders IIRC works as follows:
 
   1. If query answer in cache, reply from cache to client, stop
   2. Send query to forwarders
   3. If reply, add to cache, reply to client, stop
   4. No reply: if forward only set, error to client, stop
   5. Perform normal recursion
 
 That is - it tries cache, then the forwarders, then does recursion
 itself (unless forward only is set).
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