[SR-Users] TM: t_relay([host, port]) DNS Queries

Louis-Olivier Roof lroof at jive.com
Wed Jul 27 17:59:10 CEST 2016


Carsten,

Running dns.view on a very active system yields no output (not an error).

kamailio_4.2.0-2+deb8u1_amd64

Thanks,

Louis-Olivier

On 2016-07-27 11:21 AM, Carsten Bock wrote:
> Hi,
> 
> can you run kamcmd dns.view? There you should see, what records are
> cached and when they will be refreshed.
> 
> Thanks,
> Carsten
> 
> 
> 
> 2016-07-27 17:04 GMT+02:00 Louis-Olivier Roof <lroof at jive.com
> <mailto:lroof at jive.com>>:
> 
>     Thanks for your prompt answer Carsten,
> 
>     According to the docs, the cache should be periodically invalidated
>     according to the replies TTL (bounded by config values).
> 
>     So leaving the cache ON should be OK and still produce DNS queries,
>     which is not what I'm seeing.
> 
>     Am I misunderstanding something?
> 
>     Thanks!
> 
>     Louis-Olivier
> 
>     On 2016-07-27 10:51 AM, Carsten Bock wrote:
>     > Hi Louis-Olivier,
>     >
>     > you should look at the DNS-Parameters of the Core:
>     > http://www.kamailio.org/wiki/cookbooks/devel/core#dns_parameters
>     >
>     > Kamailio caches DNS results by default (which can be turned off).
>     >
>     > Thanks,
>     > Carsten
>     >
>     > 2016-07-27 16:47 GMT+02:00 Louis-Olivier Roof <lroof at jive.com <mailto:lroof at jive.com>
>     > <mailto:lroof at jive.com <mailto:lroof at jive.com>>>:
>     >
>     >     Dear Kamailio users,
>     >
>     >     Ref: http://kamailio.org/docs/modules/4.2.x/modules/tm.html#tm.f.t_relay
>     >
>     >     Using t_relay([host, port]) to relay messages to a specific host does
>     >     not seem to generate DNS queries to the said host after Kamailio has
>     >     initially processed the configuration file.
>     >
>     >     It resolves the host once at startup then continues using the same
>     >     IP after.
>     >
>     >     Is that expected behavior? Anyone has had this issue before and found a
>     >     way to work around it?
>     >
>     >     Note that for this specific application, messages need to be relayed to
>     >     a specified host (different from current R-URI) and this host needs to
>     >     be resolved by DNS during normal operation, not only at startup.
>     >
>     >     Thanks!
>     >
>     >     Louis-Olivier
>     >
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>     >
>     >
>     > --
>     > Carsten Bock
>     > CEO (Geschäftsführer)
>     >
>     > ng-voice GmbH
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>     > 20359 Hamburg / Germany
>     >
>     > http://www.ng-voice.com
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>     _______________________________________________
>     SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
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> 
> 
> 
> -- 
> Carsten Bock
> CEO (Geschäftsführer)
> 
> ng-voice GmbH
> Millerntorplatz 1
> 20359 Hamburg / Germany
> 
> http://www.ng-voice.com
> mailto:carsten at ng-voice.com <mailto:carsten at ng-voice.com>
> 
> Office +49 40 5247593-40
> Fax +49 40 5247593-99
> 
> Sitz der Gesellschaft: Hamburg
> Registergericht: Amtsgericht Hamburg, HRB 120189
> Geschäftsführer: Carsten Bock
> Ust-ID: DE279344284
> 
> Hier finden Sie unsere handelsrechtlichen Pflichtangaben:
> http://www.ng-voice.com/imprint/
> 
> 
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> sr-users at lists.sip-router.org
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