DDNS Updates fail When More Than 15 Authoritative Servers (NS records) are listed in a Dynamically Updated Zone

2010-09-20 Thread Christopher Cain
[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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Re: DDNS Updates fail When More Than 15 Authoritative Servers (NS records) are listed in a Dynamically Updated Zone

2010-09-20 Thread Chris Buxton
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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 bind-users mailing list
 bind-users@lists.isc.org
 https://lists.isc.org/mailman/listinfo/bind-users

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