[Freeswitch-users] SRV and TTL

[Steven Ayre]

Are you querying the DNS server directly? Some DNS servers will override a
low TTL with something longer. Local resolvers might as well. At one time
BIND also interpreted TTL=0 as the the minimum TTL for the zone (see
RFC1536).

In short you might get unpredictable results with a very short TTL. 30s
might be enough?

On Tue, 14 May 2019 at 20:49, David Villasmil <
david.villasmil.work at gmail.com> wrote:

> so:
> quote RFC1034:
>
> The meaning of the TTL field is a time limit on how long an RR can be
> kept in a cache.  This limit does not apply to authoritative data in
> zones; it is also timed out, but by the refreshing policies for the
> zone.  The TTL is assigned by the administrator for the zone where the
> data originates.  While short TTLs can be used to minimize caching, and
> a zero TTL prohibits caching,
>
> If i set the TTL to 0, shouldn't FS query everytime?
> I also don't see a MINIMUM TTL allowe, and the above does implies there
> _is_ no minimum.
>
> So, will FS not cache if it is 0? or should i just not use SRV and go with
> A records with healthchecks that set the weight to 0 if it fails? (AWS)
>
> Thanks all for your help!
>
> Regards,
>
> David Villasmil
> email: david.villasmil.work at gmail.com
> phone: +34669448337
>
>
> On Tue, May 14, 2019 at 6:12 PM Raúl Alexis Betancor Santana <
> rbetancor at gmail.com> wrote:
>
>> Any DNS TTL under 60s should be considered "Not to be cached" and do
>> real-time-query each time used, but I think that FS simply ignore TTLs,
>> things are queried once and no more.
>>
>> On Tue, May 14, 2019 at 5:09 PM David Villasmil <
>> david.villasmil.work at gmail.com> wrote:
>>
>>> Hello all,
>>>
>>> I’m testing SRV where TTL is very low, like ~5 seconds. But I don’t see
>>> FS refreshing the SRV records. Is there a minimum TTL FS will honor?
>>>
>>> Thanks all
>>>
>>> David
>>> --
>>> Regards,
>>>
>>> David Villasmil
>>> email: david.villasmil.work at gmail.com
>>> phone: +34669448337
>>> _________________________________________________________________________
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>>
>> _________________________________________________________________________
>>
>> The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
>> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
>> services.
>> Build your next product on our scalable cloud platform.
>>
>> Join our online community to chat in real time
>> https://signalwire.community
>>
>> Professional FreeSWITCH Services
>> sales at freeswitch.com
>> https://freeswitch.com
>>
>> Official FreeSWITCH Sites
>> https://freeswitch.com/oss
>> https://freeswitch.org/confluence
>> https://cluecon.com
>>
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>
> _________________________________________________________________________
>
> The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
> services.
> Build your next product on our scalable cloud platform.
>
> Join our online community to chat in real time
> https://signalwire.community
>
> Professional FreeSWITCH Services
> sales at freeswitch.com
> https://freeswitch.com
>
> Official FreeSWITCH Sites
> https://freeswitch.com/oss
> https://freeswitch.org/confluence
> https://cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
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