Forwarders option in BIND

Kevin Darcy kcd at daimlerchrysler.com
Fri Jun 4 19:30:02 UTC 2004


ludovic LECLERC wrote:

>hi,
>I would like to know if there is a way to reduce time interval between
>requests sent by name server to a list of forwarders. I made some
>tests and I found that when there are multiple forwarders in a list
>just like :
>
>forwarders {ip_addr1; ip_addr2; ip_addr3; ip_addr4;};
>
>name server wait for 2 seconds before it sends the request to the next
>one when forwarder does not answer (if ip_addr4 is the only one who's
>alive, I'll wait for 6 seconds before it gets the request).
>
>I'm using a linux server running BIND v9.2.
>
>Anyone knows a way to reduce this 2 seconds interval or better be able
>to send requests to all forwarders of a list at the same time ? It
>would really help me !
>
No, there's no way to tune this in BIND.

If you're having problems with your forwarding, and you have an option 
to not use forwarding, then *turn*it*off*. Oftentimes forwarding doesn't 
deliver the performance benefits people expect, and can actually give 
you worse performance. Use it only when necessary (in "forward only" 
mode to deal with a connectivity issue) or, in "forward first" mode, 
only if the performance benefits are clearly demonstrated.

                                                                         
                                       - Kevin




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