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
purposes.
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 host.domain.com to 10.10.10.10: 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: ch...@christophercain.ca
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