[SR-Users] Kamailio - DMQ dns srv Question

Thu Sep 22 15:08:29 CEST 2016

Hi charles,
Inline
Thanks

2016-09-22 13:51 GMT+01:00 Charles Chance <charles.chance at sipcentric.com>:

> Hi José,
>
> In your config, you need to tell DMQ about a minimum of one other node.
> This can be in the form of an IP or FQDN - however, where the FQDN resolves
> to a single IP, it does not make sense to perform anything other than an A
> lookup, so you should set the parameter to 0 in this case.
>
> The number of nodes in your cluster is irrelevant - once started, DMQ will
> contact the one you have told it about and learn about the others
> automatically.
>
> Optionally, you can tell DMQ about multiple nodes upfront (to account for
> instances where the first one may be down or unreachable), by giving it an
> FQDN which resolves to multiple IP addresses - in which case you'll need to
> set the multi_notify parameter to 1.
>


> >> This is the reason that I'm using multi_notify, the doubt here was why
> it is querying dns using SRV without service specification.
>


>
>
Does that help?
>
> Cheers,
> Charles
>
>
> On 22 September 2016 at 13:36, José Seabra <joseseabra4 at gmail.com> wrote:
>
>> Hi Charles
>> I have modparam("dmq", "multi_notify", 1) because my A record resolves
>> more than one Kamailio addresses, and if i understood well the
>> documentation says that we need set it to a value different of 0 to resolve
>> all ip addresses associated to the Name configured on DMQ.
>> I'm using DMQ with 4 kamailio instances, so i think that i need have it
>> set to a value different than 0, or i'm wrong?.
>>
>> Documentation says:
>>
>> Enables the ability to resolve multiple IPv4/IPv6 addresses for a single
>> notification address.
>>
>> A value of zero resolves to the first IP address found. A non-zero value
>> resolves to all IP addresses associated with the host. This includes
>> addresses from DNS SRV records, A and AAAA records.
>>
>> *Default value is “0”.*
>>
>> Thank you
>> Cheers
>> José
>>
>>
>>
>> 2016-09-22 13:28 GMT+01:00 Charles Chance <charles.chance at sipcentric.com>
>> :
>>
>>> Hey,
>>>
>>> On 22 September 2016 at 12:18, José Seabra <joseseabra4 at gmail.com>
>>> wrote:
>>>
>>>> Hello Daniel and Charles,
>>>> Thank you for your feedback.
>>>> Another doubt is when we use a FQDN that only resolves as A record,
>>>> would be better DMQ send only a A query or is there any reason for always
>>>> try SRV?
>>>>
>>>>
>>> As far as I recall (it's been a while since I did anything with this),
>>> the default behaviour is to query A record only. There is a mod_param to
>>> enable multi-record/SRV lookup:
>>>
>>> modparam("dmq", "multi_notify", 1)
>>>
>>> But the default is off.
>>>
>>> Is this not the behaviour you are seeing?
>>>
>>> Cheers,
>>> Charles
>>>
>>>
>>>
>>>
>>>> Thank you for your great job.
>>>>
>>>> BR
>>>> José Seabra
>>>>
>>>> 2016-09-22 8:33 GMT+01:00 Charles Chance <charles.chance at sipcentric.com
>>>> >:
>>>>
>>>>> Hello,
>>>>>
>>>>> I can take a look today.
>>>>>
>>>>> Cheers,
>>>>> Charles
>>>>>
>>>>> On 22 Sep 2016 06:20, "Daniel-Constantin Mierla" <miconda at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> I guess that the one who did the implementation of the srv query for
>>>>>> dmq hasn't "allocated" any service name. I haven't looked at the sources,
>>>>>> but I guess it should be a small patch to compose the srv dns string to be
>>>>>> queried -- maybe that part can be made a mod param so each can choose its
>>>>>> preferred service.
>>>>>>
>>>>>> Cheers,
>>>>>> Daniel
>>>>>>
>>>>>> On 21/09/16 19:28, José Seabra wrote:
>>>>>>
>>>>>> Hello,
>>>>>> I have a doubt related with DMQ dns behavior, I noticed that when
>>>>>> kamailio starts, it tries to resolve DMQ name configured on parameter
>>>>>> notification_address as the following sequence:
>>>>>>
>>>>>>    1. SRV
>>>>>>    2. A
>>>>>>    3. AAAA
>>>>>>
>>>>>>
>>>>>> Isn't supposed kamailio  try first resolve the  NAPTR DMQ name, and
>>>>>> then SRV?
>>>>>> I'm asking this because kamailio is trying resolve the SRV record
>>>>>> without any transport protocol specified on query, as my dns server only
>>>>>> accepts queries on the format "_Service._Proto.Name" the SRV will never be
>>>>>> resolved.
>>>>>>
>>>>>> Thank you.
>>>>>> BR
>>>>>> --
>>>>>> José Seabra
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing listsr-users at lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Daniel-Constantin Mierlahttp://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
>>>>>> Kamailio Advanced Training, Berlin, Oct 24-26, 2016 - http://www.asipto.com
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing
>>>>>> list
>>>>>> sr-users at lists.sip-router.org
>>>>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>>>>>
>>>>>>
>>>>> Sipcentric Ltd. Company registered in England & Wales no. 7365592. Registered
>>>>> office: Faraday Wharf, Innovation Birmingham Campus, Holt Street,
>>>>> Birmingham Science Park, Birmingham B7 4BB.
>>>>>
>>>>> _______________________________________________
>>>>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>>>>> sr-users at lists.sip-router.org
>>>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Cumprimentos
>>>> José Seabra
>>>>
>>>> _______________________________________________
>>>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>>>> sr-users at lists.sip-router.org
>>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>>>
>>>>
>>>
>>>
>>>
>>> Sipcentric Ltd. Company registered in England & Wales no. 7365592. Registered
>>> office: Faraday Wharf, Innovation Birmingham Campus, Holt Street,
>>> Birmingham Science Park, Birmingham B7 4BB.
>>>
>>> _______________________________________________
>>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>>> sr-users at lists.sip-router.org
>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>>
>>>
>>
>>
>> --
>> Cumprimentos
>> José Seabra
>>
>> _______________________________________________
>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>> sr-users at lists.sip-router.org
>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>
>>
>
> Sipcentric Ltd. Company registered in England & Wales no. 7365592. Registered
> office: Faraday Wharf, Innovation Birmingham Campus, Holt Street,
> Birmingham Science Park, Birmingham B7 4BB.
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> sr-users at lists.sip-router.org
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>
>


-- 
Cumprimentos
José Seabra
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