[Samba] Samba4 Internal DNS - CNAME not working

Thomas Simmons twsnnva at gmail.com
Thu Jan 31 12:32:58 MST 2013

I think I understand what you are saying. I tried it, and it works, but it
does not buy me anything in my specific case. It's a bit confusing, but
I'll try to make sense of it :)

As I mentioned, autodiscover.FOO.com <http://autodiscover.foo.com> is a
third party domain that I do not have control over, and their IP changes
often (the reason they tell us to use a CNAME). At the same time, the
application requires a valid record for
autodiscover.MYDOMAIN.com<http://autodiscover.testdom.com>that points
to their servers. I can add an A record for
autodiscover.MYDOMAIN.com <http://autodiscover.testdom.com> that points
directly to the current IP of
autodiscover.FOO.com<http://autodiscover.foo.com>and all is well.
Using the workaround you mention, I would create and A
record autodiscover-tmp.MYDOMAIN.com
<http://autodiscover-tmp.testdom.com>and point that the the current IP
autodiscover.FOO.com <http://autodiscover.foo.com>, then create a CNAME of
autodiscover.MYDOMAIN.com <http://autodiscover.testdom.com> that aliases
autodiscover-tmp.MYDOMAIN.com <http://autodiscover-tmp.testdom.com>. While
this indeed works, once the IP of
autodiscover.FOO.com<http://autodiscover.foo.com>changes, I'll still
have to update a local A record - autodiscover-tmp
instead of autodiscover. Samba4 also has some problems with MX records,
where they are reported by dig and samba-tool, but my mail server can't
locate it, though I don't know if they are related. and I suspect these are
related. I may have to see about moving DNS from internal to bind9_dlz, if
that's even possible. Thank you for your help.

On Thu, Jan 31, 2013 at 1:35 PM, Ricky Nance <
ricky.nance at weaubleau.k12.mo.us> wrote:

> I think it'd be worth a shot. I could help you in a couple of hours. If
> you want to catch me on IRC that would be quite helpful.
> Ricky
> On Thu, Jan 31, 2013 at 12:27 PM, Thomas Simmons <twsnnva at gmail.com>wrote:
>> Thank you Ricky, though I don't think this will help in my case. Please
>> let me know if you think otherwise.
>> autodiscover.foo.com is a third party domain that I do not have control
>> over. They have multiple A records which will change from time to time.
>> We must create a CNAME for autodiscover.testdom.com which aliases to
>> autodiscover.foo.com.
>> We had an A record in place, so autodiscover.testdom.com would point
>> directly to the current IP of autodiscover.foo.com. The IP of
>> autodiscover.foo.com changed at some point, which caused some major
>> issues.
>> On Thu, Jan 31, 2013 at 1:10 PM, Ricky Nance <
>> ricky.nance at weaubleau.k12.mo.us> wrote:
>>> Looks like you rediscovered my bug ;) ..
>>> https://bugzilla.samba.org/show_bug.cgi?id=9409 There is a work around
>>> there.
>>> Ricky
>>> On Thu, Jan 31, 2013 at 9:50 AM, Thomas Simmons <twsnnva at gmail.com>wrote:
>>>> Hello,
>>>> It seems Samba4 is having problems with CNAME records. I am seeing the
>>>> same
>>>> behavior as mentioned in the thread below. Is there any ETA on a fix for
>>>> this? This is identical to the problem with MX records. This is
>>>> currently a
>>>> much bigger problem than the MX records. I appreciate any assistance.
>>>> [root at DC1 var]# dig autodiscover.testdom.com CNAME
>>>> ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.6 <<>>
>>>> autodiscover.testdom.com CNAME
>>>> ;; global options: +cmd
>>>> ;; Got answer:
>>>> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24296
>>>> ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
>>>> ;autodiscover.testdom.com.      IN      CNAME
>>>> autodiscover.testdom.com. 900   IN      CNAME   autodiscover.foo.com.
>>>> ;; Query time: 1 msec
>>>> ;; SERVER:
>>>> ;; WHEN: Thu Jan 31 10:35:32 2013
>>>> ;; MSG SIZE  rcvd: 77
>>>> [root at DC1 var]# ping autodiscover.testdom.com
>>>> ping: unknown host autodiscover.testdom.com
>>>> [root at DC1 var]# samba-tool dns query dc1 testdom.com autodiscover CNAME
>>>> Password for [Administrator at INTERNAL.TESTDOM.COM]:
>>>>   Name=, Records=1, Children=0
>>>>     CNAME: autodiscover.foo.com. (flags=f0, serial=65, ttl=900)
>>>> https://lists.samba.org/archive/samba/2012-May/167562.html
>>> --
> --

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