[asterisk-users] asterisk fails when DNS or internet fails

Satish Patel satish_lx at hotmail.com
Tue May 31 07:08:57 CDT 2011


I our setup we don't have DNS or Internet connectivity but we are good  
no issue so far.

--
Sent from my iPhone

On May 31, 2011, at 7:24 AM, Hans Witvliet <hwit at a-domani.nl> wrote:

> On Mon, 2011-05-30 at 23:15 -0400, Jeff LaCoursiere wrote:
>>
>> On Mon, 30 May 2011, Sherwood McGowan wrote:
>>
>>> True, but with all due respect, if the cache's TTL expires and the  
>>> OP's
>>> PBX cannot reach an external DNS server, they have bigger  
>>> problems ;-)
>>>
>>> Slainte all!
>>> The Mick
>>>
>>
>> I couldn't disagree more.  In fact I think this problem is more  
>> serious
>> than it is getting credit for, when asterisk is in use in places  
>> where
>> Internet connectivity is far from stable.  I have several hotels  
>> that have
>> gone without Internet connectivity for days, and somewhere between  
>> one and
>> three days down they can only spottily call within the system, and  
>> can't
>> make outbound calls on their voice T1.  Its certainly true that  
>> they were
>> suffering without Internet access, but it is very hard to explain  
>> to the
>> owners why they can't use their phones.  In fact the symptoms are  
>> very
>> strange - inbound calls on the T1 get the auto-attendant, but  
>> internal
>> transfers fail.  No one can call outbound, and only *sometimes* do
>> internal extension to extension calls fail.
>>
>> I still scratch my head about what exactly asterisk is trying to  
>> lookup
>> that keeps it from being able to place internal SIP calls from  
>> extension
>> to extension, and sadly the few times this has occurred I wasn't  
>> around to
>> debug.
>>
>> Hasn't anyone managed to solve this with something better than a  
>> caching
>> DNS server, which seems to only last a short while?  What exactly  
>> is going
>> on that is failing?
>>
>
> What kind of info is it about?
> If it is the hostname of _local_ machines/clients, you should be
> authoritive. That should keep asterisk happy.
> If it is about remote nodes, well if your isp-connection is lost, you
> can not contact them anyway ;-(
>
> So run locally your bind-server, authoritive for your own addresses,  
> and
> caching for external ones.
>
> hw
>
> --
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