Hello!
I have a quick question about the internal DNS resolver and cache embedded in Kamailio.
Is the ability to add an entry with dns.add_a bypass the "real" DNS lookup? So, let's say that sip.example.com is publicly resolve alternatively with 1.2.3.4 & 5.6.7.8.9, if I do a dns.add_a to add my own sip.example.com with, alternatively, 127.0.0.1 and 127.0.0.2, will it work?
Thanks for your highlight!
Regards,
Igor.
Hello,
On 11.01.24 19:07, Igor Potjevlesch via sr-users wrote:
Hello!
I have a quick question about the internal DNS resolver and cache embedded in Kamailio.
Is the ability to add an entry with dns.add_a bypass the "real" DNS lookup? So, let's say that sip.example.com is publicly resolve alternatively with 1.2.3.4 & 5.6.7.8.9, if I do a dns.add_a to add my own sip.example.com with, alternatively, 127.0.0.1 and 127.0.0.2, will it work?
yes, it should work, the internal cache is checked first and if entry found, then it is used.
You can also add entries in the dns cache at startup via dns_cache modparam from corex.
Cheers, Daniel
Hello Daniel,
Thanks! I wll try. I didn't find out how to use dns.add_a. Is someone has the exact params lists? Thank you.
Regards,
Igor.
De : Daniel-Constantin Mierla miconda@gmail.com Envoyé : jeudi 11 janvier 2024 19:36 À : Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Cc : Igor Potjevlesch igor.potjevlesch@gmail.com Objet : Re: [SR-Users] Internal DNS resolver
Hello,
On 11.01.24 19:07, Igor Potjevlesch via sr-users wrote:
Hello!
I have a quick question about the internal DNS resolver and cache embedded in Kamailio.
Is the ability to add an entry with dns.add_a bypass the "real" DNS lookup? So, let's say that sip.example.com is publicly resolve alternatively with 1.2.3.4 & 5.6.7.8.9, if I do a dns.add_a to add my own sip.example.com with, alternatively, 127.0.0.1 and 127.0.0.2, will it work?
yes, it should work, the internal cache is checked first and if entry found, then it is used.
You can also add entries in the dns cache at startup via dns_cache modparam from corex.
Cheers, Daniel
Hello,
the core rpc lack proper documentation, not like the case of modules. In this case, the code should be suggestive of what parameters have to be provided:
- https://github.com/kamailio/kamailio/blob/master/src/core/dns_cache.c#L4744
For each of those values, the corex docs for dns_cache parameter should give details.
Cheers, Daniel
On 12.01.24 11:05, Igor Potjevlesch wrote:
Hello Daniel,
Thanks! I wll try. I didn't find out how to use dns.add_a. Is someone has the exact params lists? Thank you.
Regards,
Igor.
*De :*Daniel-Constantin Mierla miconda@gmail.com *Envoyé :* jeudi 11 janvier 2024 19:36 *À :* Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org *Cc :* Igor Potjevlesch igor.potjevlesch@gmail.com *Objet :* Re: [SR-Users] Internal DNS resolver
Hello,
On 11.01.24 19:07, Igor Potjevlesch via sr-users wrote:
Hello! I have a quick question about the internal DNS resolver and cache embedded in Kamailio. Is the ability to add an entry with dns.add_a bypass the "real" DNS lookup? So, let's say that sip.example.com is publicly resolve alternatively with 1.2.3.4 & 5.6.7.8.9, if I do a dns.add_a to add my own sip.example.com with, alternatively, 127.0.0.1 and 127.0.0.2, will it work?yes, it should work, the internal cache is checked first and if entry found, then it is used.
You can also add entries in the dns cache at startup via dns_cache modparam from corex.
Cheers, Daniel
-- Daniel-Constantin Mierla (@ asipto.com) twitter.com/miconda -- linkedin.com/in/miconda Kamailio Consultancy, Training and Development Services -- asipto.com Kamailio Advanced Training, February 20-22, 2024 -- asipto.com Kamailio World Conference, April 18-19, 2024, Berlin -- kamailioworld.com
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Hello,
Wonderful! Thank you Daniel.
Regards,
Igor.
De : Daniel-Constantin Mierla miconda@gmail.com Envoyé : vendredi 12 janvier 2024 11:17 À : Igor Potjevlesch igor.potjevlesch@gmail.com; 'Kamailio (SER) - Users Mailing List' sr-users@lists.kamailio.org Objet : Re: [SR-Users] Internal DNS resolver
Hello,
the core rpc lack proper documentation, not like the case of modules. In this case, the code should be suggestive of what parameters have to be provided:
- https://github.com/kamailio/kamailio/blob/master/src/core/dns_cache.c#L4744
For each of those values, the corex docs for dns_cache parameter should give details.
Cheers, Daniel
On 12.01.24 11:05, Igor Potjevlesch wrote:
Hello Daniel,
Thanks! I wll try. I didn't find out how to use dns.add_a. Is someone has the exact params lists? Thank you.
Regards,
Igor.
De : Daniel-Constantin Mierla mailto:miconda@gmail.com miconda@gmail.com Envoyé : jeudi 11 janvier 2024 19:36 À : Kamailio (SER) - Users Mailing List mailto:sr-users@lists.kamailio.org sr-users@lists.kamailio.org Cc : Igor Potjevlesch mailto:igor.potjevlesch@gmail.com igor.potjevlesch@gmail.com Objet : Re: [SR-Users] Internal DNS resolver
Hello,
On 11.01.24 19:07, Igor Potjevlesch via sr-users wrote:
Hello!
I have a quick question about the internal DNS resolver and cache embedded in Kamailio.
Is the ability to add an entry with dns.add_a bypass the "real" DNS lookup? So, let's say that sip.example.com is publicly resolve alternatively with 1.2.3.4 & 5.6.7.8.9, if I do a dns.add_a to add my own sip.example.com with, alternatively, 127.0.0.1 and 127.0.0.2, will it work?
yes, it should work, the internal cache is checked first and if entry found, then it is used.
You can also add entries in the dns cache at startup via dns_cache modparam from corex.
Cheers, Daniel
Hello,
Just to be sure that I'm not losing my time: is there any chance to do a load-balancing using add_srv? I just tried with two equal entries but it's always the same which is returned.
Regards,
Igor.
De : Daniel-Constantin Mierla miconda@gmail.com Envoyé : vendredi 12 janvier 2024 11:17 À : Igor Potjevlesch igor.potjevlesch@gmail.com; 'Kamailio (SER) - Users Mailing List' sr-users@lists.kamailio.org Objet : Re: [SR-Users] Internal DNS resolver
Hello,
the core rpc lack proper documentation, not like the case of modules. In this case, the code should be suggestive of what parameters have to be provided:
- https://github.com/kamailio/kamailio/blob/master/src/core/dns_cache.c#L4744
For each of those values, the corex docs for dns_cache parameter should give details.
Cheers, Daniel
On 12.01.24 11:05, Igor Potjevlesch wrote:
Hello Daniel,
Thanks! I wll try. I didn't find out how to use dns.add_a. Is someone has the exact params lists? Thank you.
Regards,
Igor.
De : Daniel-Constantin Mierla mailto:miconda@gmail.com miconda@gmail.com Envoyé : jeudi 11 janvier 2024 19:36 À : Kamailio (SER) - Users Mailing List mailto:sr-users@lists.kamailio.org sr-users@lists.kamailio.org Cc : Igor Potjevlesch mailto:igor.potjevlesch@gmail.com igor.potjevlesch@gmail.com Objet : Re: [SR-Users] Internal DNS resolver
Hello,
On 11.01.24 19:07, Igor Potjevlesch via sr-users wrote:
Hello!
I have a quick question about the internal DNS resolver and cache embedded in Kamailio.
Is the ability to add an entry with dns.add_a bypass the "real" DNS lookup? So, let's say that sip.example.com is publicly resolve alternatively with 1.2.3.4 & 5.6.7.8.9, if I do a dns.add_a to add my own sip.example.com with, alternatively, 127.0.0.1 and 127.0.0.2, will it work?
yes, it should work, the internal cache is checked first and if entry found, then it is used.
You can also add entries in the dns cache at startup via dns_cache modparam from corex.
Cheers, Daniel
Just so ppl you're asking don't lose their minds either trying to be clairvoyants of your particular setup, can you post what records exactly were added and what makes you think they are not followed by Kam when selecting a destination?
So you add records with *dns.add* and then lookup them up with *dns.lookup*
Cheers,
On Fri, Jan 12, 2024 at 8:42 AM Igor Potjevlesch via sr-users < sr-users@lists.kamailio.org> wrote:
Hello,
Just to be sure that I'm not losing my time: is there any chance to do a load-balancing using add_srv? I just tried with two equal entries but it's always the same which is returned.
Regards,
Igor.
*De :* Daniel-Constantin Mierla miconda@gmail.com *Envoyé :* vendredi 12 janvier 2024 11:17 *À :* Igor Potjevlesch igor.potjevlesch@gmail.com; 'Kamailio (SER) - Users Mailing List' sr-users@lists.kamailio.org *Objet :* Re: [SR-Users] Internal DNS resolver
Hello,
the core rpc lack proper documentation, not like the case of modules. In this case, the code should be suggestive of what parameters have to be provided:
https://github.com/kamailio/kamailio/blob/master/src/core/dns_cache.c#L4744
For each of those values, the corex docs for dns_cache parameter should give details.
Cheers, Daniel
On 12.01.24 11:05, Igor Potjevlesch wrote:
Hello Daniel,
Thanks! I wll try. I didn't find out how to use dns.add_a. Is someone has the exact params lists? Thank you.
Regards,
Igor.
*De :* Daniel-Constantin Mierla miconda@gmail.com miconda@gmail.com *Envoyé :* jeudi 11 janvier 2024 19:36 *À :* Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org sr-users@lists.kamailio.org *Cc :* Igor Potjevlesch igor.potjevlesch@gmail.com igor.potjevlesch@gmail.com *Objet :* Re: [SR-Users] Internal DNS resolver
Hello,
On 11.01.24 19:07, Igor Potjevlesch via sr-users wrote:
Hello!
I have a quick question about the internal DNS resolver and cache embedded in Kamailio.
Is the ability to add an entry with dns.add_a bypass the "real" DNS lookup? So, let's say that sip.example.com is publicly resolve alternatively with 1.2.3.4 & 5.6.7.8.9, if I do a dns.add_a to add my own sip.example.com with, alternatively, 127.0.0.1 and 127.0.0.2, will it work?
yes, it should work, the internal cache is checked first and if entry found, then it is used.
You can also add entries in the dns cache at startup via dns_cache modparam from corex.
Cheers, Daniel
--
Daniel-Constantin Mierla (@ asipto.com)
twitter.com/miconda -- linkedin.com/in/miconda
Kamailio Consultancy, Training and Development Services -- asipto.com
Kamailio Advanced Training, February 20-22, 2024 -- asipto.com
Kamailio World Conference, April 18-19, 2024, Berlin -- kamailioworld.com
Sans virus.www.avast.com https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient
--
Daniel-Constantin Mierla (@ asipto.com)
twitter.com/miconda -- linkedin.com/in/miconda
Kamailio Consultancy, Training and Development Services -- asipto.com
Kamailio Advanced Training, February 20-22, 2024 -- asipto.com
Kamailio World Conference, April 18-19, 2024, Berlin -- kamailioworld.com
Kamailio - Users Mailing List - Non Commercial Discussions To unsubscribe send an email to sr-users-leave@lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe:
You're right, sorry:
kamcmd dns.add_srv _sip._udp.example.com 3600 0 50 5060 srv1.com 2
kamcmd dns.add_srv _sip._udp.example.com 3600 0 50 5060 srv2.com 2
kamcmd dns.add_a srv1.com 3600 192.168.1.1 2
kamcmd dns.add_a srv2.com 3600 192.168.1.2 2
Finally, it looks to work fine by adding:
dns_srv_lb=yes
use_dns_failover=yes
De : Sergiu Pojoga pojogas@gmail.com Envoyé : vendredi 12 janvier 2024 14:50 À : Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Cc : miconda@gmail.com; Igor Potjevlesch igor.potjevlesch@gmail.com Objet : Re: [SR-Users] Re: Internal DNS resolver
Just so ppl you're asking don't lose their minds either trying to be clairvoyants of your particular setup, can you post what records exactly were added and what makes you think they are not followed by Kam when selecting a destination?
So you add records with dns.add and then lookup them up with dns.lookup
Cheers,
On Fri, Jan 12, 2024 at 8:42 AM Igor Potjevlesch via sr-users <sr-users@lists.kamailio.org mailto:sr-users@lists.kamailio.org > wrote:
Hello,
Just to be sure that I'm not losing my time: is there any chance to do a load-balancing using add_srv? I just tried with two equal entries but it's always the same which is returned.
Regards,
Igor.
De : Daniel-Constantin Mierla <miconda@gmail.com mailto:miconda@gmail.com > Envoyé : vendredi 12 janvier 2024 11:17 À : Igor Potjevlesch <igor.potjevlesch@gmail.com mailto:igor.potjevlesch@gmail.com >; 'Kamailio (SER) - Users Mailing List' <sr-users@lists.kamailio.org mailto:sr-users@lists.kamailio.org > Objet : Re: [SR-Users] Internal DNS resolver
Hello,
the core rpc lack proper documentation, not like the case of modules. In this case, the code should be suggestive of what parameters have to be provided:
- https://github.com/kamailio/kamailio/blob/master/src/core/dns_cache.c#L4744
For each of those values, the corex docs for dns_cache parameter should give details.
Cheers, Daniel
On 12.01.24 11:05, Igor Potjevlesch wrote:
Hello Daniel,
Thanks! I wll try. I didn't find out how to use dns.add_a. Is someone has the exact params lists? Thank you.
Regards,
Igor.
De : Daniel-Constantin Mierla mailto:miconda@gmail.com miconda@gmail.com Envoyé : jeudi 11 janvier 2024 19:36 À : Kamailio (SER) - Users Mailing List mailto:sr-users@lists.kamailio.org sr-users@lists.kamailio.org Cc : Igor Potjevlesch mailto:igor.potjevlesch@gmail.com igor.potjevlesch@gmail.com Objet : Re: [SR-Users] Internal DNS resolver
Hello,
On 11.01.24 19:07, Igor Potjevlesch via sr-users wrote:
Hello!
I have a quick question about the internal DNS resolver and cache embedded in Kamailio.
Is the ability to add an entry with dns.add_a bypass the "real" DNS lookup? So, let's say that sip.example.com http://sip.example.com is publicly resolve alternatively with 1.2.3.4 & 5.6.7.8.9, if I do a dns.add_a to add my own sip.example.com http://sip.example.com with, alternatively, 127.0.0.1 and 127.0.0.2, will it work?
yes, it should work, the internal cache is checked first and if entry found, then it is used.
You can also add entries in the dns cache at startup via dns_cache modparam from corex.
Cheers, Daniel
-
Daniel-Constantin Mierla -
Igor Potjevlesch -
Sergiu Pojoga