[Dnsmasq-discuss] multiple domain support - question

[Simon Kelley]

richardvoigt at gmail.com wrote:
> On Mon, Aug 4, 2008 at 9:04 AM, Simon Kelley <simon at thekelleys.org.uk>wrote:
> 
>> I have support for multiple domains working, but I've come across a
>> wrinkle.
>>
>> Consider the case that two different DHCP clients claim the same name.
>> With the existing code, only one can have it and the current behaviour
>> is that when a second machine  claims a name, the first one loses it.
>>
>> Now, consider the possibility that the two machines claiming the same
>> name are in different domains. By default, the existing behaviour must
>> continue, because the unqualified name is added to the DNS, so that even
>> though the two clients could have "name.domain1.com" and
>> "name.domain2.com", they are still fighting over just plain "name".
>>
>> It would be possible to introduce a new mode, which didn't put the
>> unqualified name into the DNS, and allowed both hosts to keep their name
>> as long as they are in different domains. Would that be useful, or just
>> an confusing complication?
> 
> 
> Would it be possible to track the domain, while still responding to the
> unqualified name (perhaps a CNAME, or perhaps just track internally).  Then
> when the name was claimed a second time, the entry would be marked invalid
> and no further responses would be sent.

It would: it would need a fair bit of thinking to make sure it always
behaved.

> 
> Or, if you choose a mode with no unqualified names, consider allowing
> dotless names from /etc/hosts 
dotless names from /etc/hosts is fine: that's not affected.

>and the config file to still be resolved.
>From dhcp-host lines is not there at the moment.
It may be possible, but what happens when two hosts get a dotless name
from dhcp-host lines?

Of course the search facility in the resolver should fix this.....


Cheers,

Simon.