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 > _______________________________________________ > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users
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