Rotating addtlnl/auth record

James A Griffin agriffin at cpcug.org
Wed May 30 11:59:49 UTC 2001


Please ignore my other post.  I did not read your question carefully.

Sorry,
Jim


Pawel Rogocz wrote:
> 
> Hi,
> 
> is there a way to make bind rotate records in the additional/authority
> section when sending a refferal ? It seems no matter what rr-set
> clause is used the records are always send in the same order.
> The problem with that is, when you have subdomains in your domain and
> recursion is turned off, one of your authoritatives for the subdomain will
> get many more queries than the other servers. It is exactly the first one
> listed in your zone file, we can call it "primary" for the sake of
> convinience here. I see ratios of 2.5:1 in number of DNS requests going to
> "primary" vs "non-primary" on a busy site (1500 req/sec) , and it gets
> much worse on sites with less traffic, as the RTT algorithm has no time
> to kick in.
> 
> Here is an example:
> 
> If you run the following two commands
> 
> $dig msn.com a  @A.GTLD-SERVERS.NET.
> $dig msn.com ns @A.GTLD-SERVERS.NET.
> 
> you will see the first one returns records ALWAYS in the same order,
> the second one rotates them.
> 
> Pawel
> 
> --
> 
> --


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