[Dnsmasq-discuss] Mac Darwin confusion

[Bernd Prager]

On 8/4/20 3:36 AM, Andrew Miskell wrote:
>
>> On Aug 3, 2020, at 3:06 PM, Geert Stappers <stappers at stappers.nl> wrote:
>>
>> On Mon, Aug 03, 2020 at 07:04:47PM +0200, No Yes No Questions wrote:
>>> On Mon, Aug 03, 2020 at 10:44:07PM +0700, Bernd Prager wrote:
>>>> Hi all,
>>>>
>>>> I got something I can't wrap my head around. I have a QNAP NAS that I
>>>> thought would be nice for hosting a DNSMASQ service for DNS and DHCP. Setup
>>>> went smooth and all my Linux clients behave wonderfully, except my Mac
>>>> client:
>>>>
>>>> Querying a host from Linux goes perfect:
>>>>
>>>> -=[22:29:35][bernd at hoenir ~]=-
>>>>   dig @qnap freyja
>>>>
>>>> ; <<>> DiG 9.11.3-1ubuntu1.12-Ubuntu <<>> @qnap freyja
>>>> ;; Got answer:
>>>> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24213
>>>> ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
>>>>
>>>> ;; QUESTION SECTION:
>>>> ;freyja.                                IN      A
>>>>
>>>> ;; ANSWER SECTION:
>>>> freyja.                 0       IN      A 192.168.1.7
>>>>
>>>> ;; Query time: 0 msec
>>>> ;; SERVER: 192.168.1.5#53(192.168.1.5)
>>> .5
>>>
>>>
>>>> ;; WHEN: Mon Aug 03 22:29:37 +07 2020
>>>> ;; MSG SIZE  rcvd: 51
>>>>
>>>> -=[22:29:37][bernd at hoenir ~]=-
>>>>   ping -c 1 freyja
>>>> PING freyja.prager.homeip.net (192.168.1.7) 56(84) bytes of data.
>>>> 64 bytes from freyja.prager.homeip.net (192.168.1.7): icmp_seq=1 ttl=64
>>>> time=131 ms
>>>>
>>>> --- freyja.prager.homeip.net ping statistics ---
>>>> 1 packets transmitted, 1 received, 0% packet loss, time 0ms
>>>> rtt min/avg/max/mdev = 131.374/131.374/131.374/0.000 ms
>>>>
>>>> Now the same query from my Mac sees the host but still can't connect to it:
>>>>
>>>> [bernd at loki ~$ dig @qnap freyja
>>>>
>>>> ; <<>> DiG 9.10.6 <<>> @qnap freyja
>>>> ;; Got answer:
>>>> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54217
>>>> ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
>>>>
>>>> ;; QUESTION SECTION:
>>>> ;freyja.                IN    A
>>>>
>>>> ;; ANSWER SECTION:
>>>> freyja.            0    IN    A    192.168.1.7
>>>>
>>>> ;; Query time: 7 msec
>>>> ;; SERVER: 192.168.1.5#53(192.168.1.5)
>>> The same .5
>>>
>>>
>>>> ;; WHEN: Mon Aug 03 22:29:25 +07 2020
>>>> ;; MSG SIZE  rcvd: 51
>>>>
>>>> [bernd at loki ~$ ping -c 1 freyja
>>>> ping: cannot resolve freyja: Unknown host
>>>>
>>>> Does anybody have an idea what I am missing?
>>> Yes
>>>
>> DNS query tool `dig` at the Linux system does add domain name to the request.
>>
>> `dig` at the MacOS system doesn't add a domain name, which is correct behaviour.
>>
>>
>> For `ping` is it OK to add a domainname. It seems the Mac is not aware
>> of domain name.
>>
>> Find a way to tell the Mac about the .prager.homeip.net domain name.
>>
>>
>> Groeten
>> Geert Stappers
>> -- 
>> Silence is hard to parse
>>
>> _______________________________________________
>> Dnsmasq-discuss mailing list
>> Dnsmasq-discuss at lists.thekelleys.org.uk
>> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
> macOS will know about the domain if it’s told by the DNS server via DHCP.
>
> However, macOS will cache information and sometimes will need a forced reset to pick things up. Using "dscacheutil -flushcache;sudo killall -HUP mDNSResponder” should reset the DNS cache on macOS.
>
>
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Thank you all for your kind help. I wanted to give the list a quick update:

While I have not resolved the issue yet, despite trying all the 
suggestions above (except Geert's ".5" comment which I need to do some 
research on what that actually means), I have nailed the likely culprit 
to the NordVPN I have running with my particular user. Pinging my other 
Intranet-Hosts from any other user on my Mac without the VPN running 
actually works. It seems that the VPN does something to my network 
configuration that its not telling me. The Mac DNS utility still claims 
to point to my DNSMASQ instance.

By the way, pinging my internal host with a full domain name 
freyja.prager.homeip.net resolves to my DynDNS external network IP address.

Cheers,
-- Bernd