Dynamic DNS with secondary nameserver?

[Sean Thomas Caron]

Hi Sten,

Thanks for the response; you made me re-think the issue in such a way  
that I ended up solving the problem (I think).

I was going to copy and paste the NS definitions in the main zone file  
to show how I had defined the two nameservers for the subdomain and  
found that I had missed a period in there.

ddns.sph.umich.edu.		IN	NS	ns2.sph.umich.edu.
                   ^ forgot this!

I also had to rndc freeze the dynamic subdomain, go back into the zone  
file for the subdomain, and add the slave nameserver in there as well:

ddns.sph.umich.edu	IN SOA	dns.sph.umich.edu. hostmaster.sph.umich.edu. (
				2007024415 ; serial
				3600       ; refresh (1 hour)
				1800       ; retry (30 minutes)
				2419200    ; expire (4 weeks)
				86400      ; minimum (1 day)
				)
			NS	dns.sph.umich.edu.
			NS	ns2.sph.umich.edu.
                                 ^ added this line.

I was a little confused because the dynamic subdomain has been split  
off into a different file from the main zone file and I erroneously  
assumed that the DDNS subdomain would "inherit" the NS records defined  
for the parent zone. Limited experience with DDNS so I wasn't sure how  
much of that ddns.sph.umich.edu.hosts file was actually being used and  
how much of the magic was in the journal file.

So I will continue to monitor this but I think I am all set now; sorry  
to trouble everyone with this query. Indeed it works with slaves, as  
one would expect, as long as you watch the typos and keep your files  
straight!

Best,

-Sean


Quoting Sten Carlsen <stenc at s-carlsen.dk>:

> How did you tell the primary server who to notify?
>
> It should be listed in a NS RR. You can also look at the also-notify
> option.
>
> Is the slave allowed to transfer the zone, if not even a notify will not
> work.
>
>
> On 01/12/10 21:09, Sean Thomas Caron wrote:
>> Hi folks,
>>
>> We have an ISC DHCP server here feeding dynamic DNS updates to a BIND
>> 9 machine and it has generally been working fine.
>>
>> Now I am trying to add a slave nameserver to the zone and it works
>> fine for the static hosts but none of the dynamic DNS updates seem to
>> propagate to the slave.
>>
>> On the master, I have the dynamic sub-domain configured as follows:
>>
>> zone "ddns.sph.umich.edu" in {
>>     type master;
>>     file "/etc/bind/ddns.sph.umich.edu.hosts";
>>     notify yes;
>>     allow-update { key dhcpupdate; };
>> };
>>
>> This works great; the DHCP server feeds updates to the primary DNS
>> server, no problem.
>>
>> On the slave, I set it up as so:
>>
>> zone "ddns.sph.umich.edu" in {
>>     type slave;
>>     masters { 141.211.51.166; };
>>     notify no;
>>     file "/etc/bind/ddns.sph.umich.edu.hosts";
>> };
>>
>> When a host comes up on DHCP, the primary server picks it up fine:
>>
>>> server 141.211.51.166
>> Default server: 141.211.51.166
>> Address: 141.211.51.166#53
>>> sph-2006-0090-test.ddns.sph.umich.edu
>> Server:        141.211.51.166
>> Address:    141.211.51.166#53
>>
>> Name:    sph-2006-0090-test.ddns.sph.umich.edu
>> Address: 141.211.11.190
>> sph-2006-0090-test.ddns.sph.umich.edu    text =
>> "31ce446f626045a4f8fe4933f448b613c6"
>>>
>>
>>
>> But it never seems to propagate over to the slave:
>>
>>> server 141.211.51.66
>> Default server: 141.211.51.66
>> Address: 141.211.51.66#53
>>> sph-2006-0090-test.ddns.sph.umich.edu
>> Server:        141.211.51.66
>> Address:    141.211.51.66#53
>>
>> ** server can't find
>> sph-2006-0090-test.ddns.sph.umich.edu.sph.umich.edu: SERVFAIL
>>>
>>
>> I used 'rndc freeze' on the DDNS sub-domain then edited the zone file
>> to have a really short refresh interval:
>>
>> ddns.sph.umich.edu    IN SOA    dns.sph.umich.edu.
>> hostmaster.sph.umich.edu. (
>>                 2007024409 ; serial
>>                 3600       ; refresh (1 hour)
>>                 1800       ; retry (30 minutes)
>>                 2419200    ; expire (4 weeks)
>>                 86400      ; minimum (1 day)
>>                 )
>>
>>
>> Then re-enabled it with 'rndc unfreeze' but it still doesn't seem to
>> have made a difference. Even after waiting an hour, the additions to
>> the dynamic DNS zone never propagate to the slave. I'm not even sure
>> if those values are honored when dynamic DNS is enabled.
>>
>> Most sites that I have seen discussing dynamic DNS only use one DNS
>> server, so I am not exactly sure how this should be set up, or if this
>> was ever intended to work this way. Is it possible? Or should I just
>> make only the master a NS for the dynamic subdomain and leave the
>> slave for static stuff only?
>>
>> I feel like if it was going to work, I have it set up correctly..
>>
>> Thanks,
>>
>> -Sean
>>
>>
>> _______________________________________________
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>> bind-users at lists.isc.org
>> https://lists.isc.org/mailman/listinfo/bind-users
>
> --
> Best regards
>
> Sten Carlsen
>
> No improvements come from shouting:
>
>        "MALE BOVINE MANURE!!!"
>
>