DDNS : Multiple domains

[Chris Buxton]

Answer: ddns-domainname sets the DDNS domain, regardless of option 15 (option domain-name). It defaults to the same value as option 15, but you have it set explicitly at the global level. Therefore:

Solution 1: Change "ddns-domainname" at the global level to "option domain-name", thus telling the clients what domain they're in and allowing ddns-domainname to use its default behavior of matching this value
Solution 2: In yoru host declaration, add 'ddns-domainname "newdomain.net";'

Regards,
Chris Buxton

> On Oct 26, 2018, at 7:44 AM, Nicolas Ecarnot <nicolas.dhcp-users at ecarnot.net> wrote:
> 
> Le 26/10/2018 à 16:43, Nicolas Ecarnot a écrit :
>> Hello,
>> Our DDNS setup is 100% OK since years.
>> Our global config is using :
>> ------------------------------------
>> ddns-update-style interim;
>> ddns-domainname "olddomain.net.";
>> ddns-rev-domainname "in-addr.arpa.";
>> zone olddomain.net. {
>>   primary 192.168.10.1;
>>   key olddomain-nsupdate;
>> }
>> ------------------------------------
>> For a specific host, I'm trying to ask the DHCP server to register the DNS record with a second domain.
>> Before :
>> ------------------------------------
>> host myhost {
>>   hardware ethernet aa:bb:cc:dd:ee:ff;
>>   fixed-address 192.168.1.2;
>> }
>> ------------------------------------
>> After :
>> ------------------------------------
>> host myhost {
>>   hardware ethernet aa:bb:cc:dd:ee:ff;
>>   fixed-address 192.168.1.2;
>>   option domain-name "newdomain.net";
>> }
>> # I added :
>> zone newdomain.net. {
>>   primary 192.168.10.2;
>>   key newdomain-nsupdate;
>> }
>> ------------------------------------
>> I'm witnessing that the correct new domain is sent to the host.
>> But I see that the server is building myhost.olddomain.net and sending it to the old DHCP server.
> 
> Sorry, I ment : "to the old DNS server"
> 
>> My questions :
>> - what is the way to tell the DHCP server to use the new domain for this host?
>> - how comes the newdomain.net zone settings are never used?
>> Thank you for your help.
> 
> 
> -- 
> Nicolas ECARNOT
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