It probably has something to do with the packet size. You can't easily fit 25 
NS records into a 512 byte UDP packet.

You really don't want to have more than 8 published NS records for most 

Chris Buxton
BlueCat Networks

On Sep 20, 2010, at 2:30 PM, Christopher Cain wrote:

> [I apologize in advance if this is a double post.  I'm not sure if my 
> original went through]
> I was implementing ISC Bind 9.5 at a client site last month and had a single 
> zone that accepted DDNS updates only from the ISC DHCP service.
> The environment consisted of a Master BIND server and almost 25 Windows slave 
> servers.  All DNS servers were listed as authoritative at first.  This caused 
> DDNS updates from DHCP to fail with the following message:
> "Unable to add forward map from to DNS format 
> error".
> After spending quite a bit of time troubleshooting this issue with no luck, I 
> was finally successful with DDNS updates after I reduced the number of 
> authoritative servers for the dynamic zone to 15.  Since I have done this, 
> the issue has not resurface.
> Can anyone help explain to me why this happened and if there is anything I 
> can do to avoid this from happening in the future?
> Thanks,
> Christopher Cain
> E:
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