[reSIProcate] DNS SRV multiple records and timeouts

[Nathan Stratton]

Rather then keep asking about this, I just tried it, and it works.

I was not understanding how the 2nd record would be tried because with the
non whitelist version we were never seeing the 2nd record tried, so I did
not understand how it would be added to the whitelist for the next
connection attempt.


On Thu, Aug 15, 2013 at 1:46 PM, Scott Godin <sgodin at sipspectrum.com> wrote:

> I'm not understanding this.  If the first path tried times out (ie: 408)
> then it is greylisted and we try a new path (ignoring the greylisted one)
>  - the working path then get's whitelisted.
>
> Scott
>
>
> On Thu, Aug 15, 2013 at 2:44 PM, Nathan Stratton <nathan at robotics.net>wrote:
>
>> Right, got that, but because the first record times out, the 2nd one is
>> never tried, thus never added to the whitelist.
>>
>>
>> On Thu, Aug 15, 2013 at 1:43 PM, Scott Godin <sgodin at sipspectrum.com>wrote:
>>
>>> From the wiki:
>>>
>>>    - DNS path is whitelisted when we receive any response that doesn't
>>>    result in a grey list or a black list
>>>
>>>
>>> By response it is referring to a SIP response (ie: 200, 404, etc.).  So
>>> once a good path is found, resip will stick to it.
>>>
>>> Scott
>>>
>>>
>>> On Thu, Aug 15, 2013 at 2:16 PM, Nathan Stratton <nathan at robotics.net>wrote:
>>>
>>>> On Thu, Aug 15, 2013 at 12:44 PM, Scott Godin <sgodin at sipspectrum.com>wrote:
>>>>
>>>>> Hi Nathan,
>>>>>
>>>>> For Whitelisting - what do you mean about knowing all the hosts
>>>>> upfront?   I was referring to enabling the resip DNS Whitelisting feature -
>>>>> this doesn't require knowing anything up front.
>>>>>
>>>>
>>>> I guess I don't understand how a record would get whitelisted. The DUM
>>>> would get two records back from the SRV record, and try the first that
>>>> would be grey listed because of a timeout. It looks like a path is
>>>> whitelisted when there is a response that does not end in grey or black.
>>>>
>>>> I guess I thought that because the 2nd record was never tried, you
>>>> would need to add them to the whitelist before hand so that on the next
>>>> request you would try the 2nd host first rather then the first timeout host.
>>>>
>>>> --
>>>> ><>
>>>> Nathan Stratton                                               Founder,
>>>> CTO Exario Networks, Inc.
>>>> nathan at robotics.net                                     nathan at
>>>> exarionetworks.com
>>>> http://www.robotics.net
>>>> http://www.exarionetworks.com/
>>>>
>>>
>>>
>>
>>
>> --
>> ><>
>> Nathan Stratton                                               Founder,
>> CTO Exario Networks, Inc.
>> nathan at robotics.net                                     nathan at
>> exarionetworks.com
>> http://www.robotics.net
>> http://www.exarionetworks.com/
>>
>
>


-- 
><>
Nathan Stratton                                               Founder, CTO
Exario Networks, Inc.
nathan at robotics.net                                     nathan at
exarionetworks.com
http://www.robotics.net
http://www.exarionetworks.com/
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