Re: Fixing Asterisk DNS - bug 9152, asynchronous DNS, etc

Hi!

(open)ser also has similar problems to due lack of asynch
DNS - but at 
least they allow to configure DNS timeouts. Thus, a
workaround is 
setting low timeout values. I do not know if Asterisk
supports this - 
but surely will be easier to implement than asynch DNS.

regards
klaus

Kristian Kielhofner wrote:
> On 6/20/07, Jeffrey C. Ollie <jeffocjtech.us> wrote:
>> On Wed, 2007-06-20 at 15:13 -0400, Kristian
Kielhofner wrote:
>>>   It appears that a good start would be making
Asterisk DNS resolution
>>> asynchronous inside of dns.c and making dns
manager work with
>>> chan_sip.  Or maybe not.  Does anyone with more
clue have any better
>>> ideas?
>> Outside of making every DNS lookup in Asterisk
asynchronous, your best
>> bet would be to run BIND as a caching-only
nameserver on the Asterisk
>> box.  Change the resolv.conf to point to 127.0.0.1.
 If you need to run
>> DNS queries through your ISP's nameservers you can
tell BIND to forward
>> all queries through those nameservers.
>>
>> Jeff
>>
> 
> Jeff,
> 
>   I have used that "solution" with mixed
results in the past (usually
> using dnsmasq).  The problem is that no good DNS Cache
will cache a
> result longer than the TTL on the record so your
"success" using this
> solution will depend more on the TTL than anything
else...
> 
>   I'd like to fix the real problem in Asterisk and not
depend on any
> external hacks.  This includes:
> 
> - DNS Caches
> - Hosts files
> - etc
> 

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Klaus Darilion wrote:
> (open)ser also has similar problems to due lack of
asynch DNS - but at 
> least they allow to configure DNS timeouts. Thus, a
workaround is 
> setting low timeout values. I do not know if Asterisk
supports this - 
> but surely will be easier to implement than asynch
DNS.

We already have an asynchronous DNS handler.  It's just that
most of the
code hasn't been converted to use it.  It is open for anyone
to jump on
and as I said before, it's not terribly difficult to do, but
it will
take some time.

-- 
Russell Bryant
Software Engineer
Digium, Inc.

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