BIND9, DynDNS, Multiple RRs

[Chris Buxton]

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I should clarify that you may have trouble finding a domain registrar  
willing to take name server names that have dynamic IP's - they tend  
to want to provide glue if possible, and glue records tend by their  
nature to be static IP's. It's most likely possible to work around  
this in some fashion, but you'll need to be creative.

Chris Buxton
Professional Services
Men & Mice

On Sep 22, 2008, at 5:04 PM, Chris Buxton wrote:

> First, do not use CNAME's for your name server names. That means, the
> following is wrong and will not work reliably:
>
> abc.biz.       NS     dns1.abc.biz.
> dns1.abc.biz.  CNAME  a.dyndns.biz.
>
> Second, there's no reason to give the same name to both DSL
> connections. Just because it's the same server doesn't mean the
> outside world needs to see it as one server with two (public) IP
> addresses. Use two names.
>
> abc.biz.       NS     a.dyndns.biz.
> abc.biz.       NS     b.dyndns.biz.
>
> Chris Buxton
> Professional Services
> Men & Mice
>
> On Sep 22, 2008, at 2:54 PM, Theophanis Kontogiannis wrote:
>
>> Hello All,
>>
>>
>> I have my DNS server, serving my .biz zone, NATed behind 2xDSL
>> routers /
>> connections.
>>
>> The DNS is running on Centos 5 and bind-9.3.4-6.0.2.P1.el5_2.
>>
>> The DSL modems (I have two connections) are using DynDNS since the  
>> DSL
>> connection is provided with dynamic DNS allocations.
>>
>> We assume that modem A gets declared on DynDNS as "a.dyndns.biz."
>> and modem
>> B as "b.dyndns.biz.".
>>
>>
>>
>> What I try to do, is to make my NATed DNS, master for my domain (let
>> us call
>> it abc.biz.)
>>
>>
>>
>> On the registrar I have to declare that my primary DNS for abc.biz.
>> is the
>> DNS accessible through either DSL modem.
>>
>>
>>
>> I define dns1.abc.biz. as the primary DNS.
>>
>> However since this a DynDNS registered IP, I have to define
>> dns1.abc.biz. as
>> a CNAME to "a.dyndns.biz.".
>>
>> But there are two DSL connections for redundancy and load balancing.
>>
>> So if I also define dns1.abc.biz. as a CNAME to "b.dyndns.biz." then
>> I get
>> the error:
>>
>>               "multiple RRs of singleton type"
>>
>>
>>
>> I googled a bit, and found out that after BIND 9.1 the multiple- 
>> cnames
>> directive got forced obsolete.
>>
>>
>>
>> Is there any way to succeed in what I try with BIND9?
>>
>>
>>
>> If I have to write the zone file in a different way, can you please
>> explain
>> the way, since it is not obvious to me?
>>
>>
>>
>> Thank you All for your time,
>>
>>
>>
>> Theophanis Kontogiannis
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>

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