[Developers] DNS Caching in Elastix

Alex Neuman alex at rtpty.com
Sat Dec 12 11:16:28 ECT 2009


Then SMEServer is not doing the caching properly if you lose asterisk services when your ISP goes down.

On Dec 12, 2009, at 10:47 AM, jose velez wrote:

> Yes but I use it in load balancing.  Also I have SMEserver in the gateway which does the dns caching since elastix is pointing to it.
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> On Dec 12, 2009 10:04 AM, Ing. Fernando M. Villares Terán - InteliX Ingeniería & Telecomunicaciones wrote:
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> I have a similar solution, a firewall with fail over and dns caching in it
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> Saludos Cordiales,
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> Ing. Fernando M. Villares Terán
> 
> Mat. CIE. 2-2517-7
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> Ingeniería & Telecomunicaciones
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> De: developers-bounces at lists.elastix.org [mailto:developers-bounces at lists.elastix.org] En nombre de jose velez
> Enviado el: sábado, 12 de diciembre de 2009 10:14 a.m.
> Para: Mailing list for Developers
> Asunto: Re: [Developers] DNS Caching in Elastix
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> What four packages?  I have try the Elastixconnection fix and did not work.  Internet fails all SIP do not register.  I have fix it hardware wise with two internet providers with a dual port router.
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> On Dec 12, 2009 05:05 AM, Mark Brooker wrote:
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> Hi Team
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> Most of you will know of this bug in Asterisk. When you add a SIP trunk and asterisk cant access DNS, the whole SIP protocol falls over. None of the IP phones will register and no calls can be made out. Basically Digium should fix the issue in asterisk however we should try out best to do all the work arounds we can to stop the issue. The best work around I have seen is setting up BIND as a local DNS cache. It is not a perfect solution because the cache is lost after every reboot however if the internet goes down, Elastix will still be able to make and take calls through the PSTN.
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> At the moment the Elastix GUI writes into /etc/resolv.conf for its DNS.
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> The best way forward would be to setup bind as a caching server. This is very easy and can be done by simply installing 4 packages. In resolv.conf we should be setting the nameserver to 127.0.0.1.
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> When people enter in their ISPs DNS server it should be entered into BINDs configuration as a forwarding server.
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> This will make Elastix far more stable and if the internet goes down then Elastix should still work as per normal.
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> 
> Ing. José M. Vélez PE
> Vélez Computer System
> 1353 Estrella St.
> San Juan, Puerto Rico 00907
> 787 723-5145 fax 721-0062
> 888-402-6665
> email jmvelez at velezcomputer.com
> 
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> 
> Ing. José M. Vélez PE
> Vélez Computer System
> 1353 Estrella St.
> San Juan, Puerto Rico 00907
> 787 723-5145 fax 721-0062
> 888-402-6665
> email jmvelez at velezcomputer.com
> <jose velez.vcf>_______________________________________________
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