[Dnsmasq-discuss] Does dnsmasq support cname within same domain?

[Matus UHLAR - fantomas]

>> > > On Tue, Mar 01, 2022 at 01:01:51AM -0800, Frank Liu wrote:
>> > > > I am running dnsmasq for dhcp/dns of a local test domain: test.example.com.
>> > > > Everything works fine. When a dhcp client (eg: client1) comes up, it gets
>> > > > the IP from dnsmasq, and I can dig/nslookup client1.test.example.com to get
>> > > > its IP.
>> > > >
>> > > > When I add a cname in the same domain, eg:
>> > > > cname=alias.test.example.com,client1.test.example.com
>> > > >
>> > > > dig/nslookup of alias.test.example.com only returns name
>> > > > client1.test.example.com, not the actual IP of client1.test.example.com
>> > > >
>> > > > It's interesting that if I add the cname for a different domain, eg:
>> > > > cname=alias.dummy.example.com,client1.test.example.com
>> > > >
>> > > > dig/nslookup of alias.dummy.example.com will return both name
>> > > > client1.test.example.com and its IP.
>> > > >
>> > > > I tried a few different versions but that doesn't make a difference.

>> > On Tue, Mar 1, 2022 at 3:37 AM Geert Stappers via Dnsmasq-discuss wrote:
>> > > Please name those different versions.

>> On Tue, Mar 01, 2022 at 09:21:58AM -0800, Frank Liu wrote:
>> > 2.76 (Debian 9),   2.85 (Debian 11).

>On Tue, Mar 1, 2022 at 2:39 PM Geert Stappers via Dnsmasq-discuss 
> <dnsmasq-discuss at lists.thekelleys.org.uk> wrote:
>> Ah, I'm now beyond the ambiguty of different version of dig/nslookup.

On 02.03.22 01:28, Frank Liu wrote:
>I don't think it matters with test OS or test application.

it may matter, 

>I also tried:
>ping alias.dummy.example.com works, but ping alias.test.example.com gives
>unknown host error.
>(even though both names cname to the same client1.test.example.com in
>dnsmasq).

What do there result in?

dig alias.dummy.example.com alias.test.example.com client1.test.example.com
dig -t any alias.dummy.example.com alias.test.example.com client1.test.example.com


>I tried ping from various machines (Mac, Windows, Debian 9, Debian11) on
>the test network. Same result.
>
>I also tried curl alias.test.example.com which gives: curl: (6) Could not
>resolve host: alias.test.example.com
>but curl alias.dummy.example.com works fine.

ping and curl are not tools for debugging DNS problems.

>> > > > Is this a known issue/limitation?
>> > >
>> > > What is the actual question?
>> > >
>> >
>> > Sorry, the question is in the email Subject. I guess it isn't clear, so I
>> > am pasting here:
>> > Does dnsmasq support cname within same domain?

>> I think it is more a dns-client problem as a dnsmasq problem.
>> As in: I don't yet understand the "problem".
>>
>
>Are you implicitly answering my question in the subject line with a "Yes"
>answer, because if the answer is "no", there is really no need to
>troubleshoot any further.

there seems to be no limitation of what you asked for, however if there's a 
problem, we should find it first.


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Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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