[asterisk-bugs] [Asterisk 0013900]: [feature request] Asterisk does not respect DNS TTL in iax.conf

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=13900 
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Reported By:                ffadaie
Assigned To:                mvanbaak
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Project:                    Asterisk
Issue ID:                   13900
Category:                   Channels/chan_iax2
Reproducibility:            always
Severity:                   feature
Priority:                   normal
Status:                     assigned
Asterisk Version:           1.4.22 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             2008-11-13 23:07 CST
Last Modified:              2008-12-17 16:39 CST
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Summary:                    [feature request] Asterisk does not respect DNS TTL
in iax.conf
Description: 
This is probably not specific to IAX but I just tried it for IAX so I am
not sure about the other channels.
The problem is :
when you Dial and IAX channel either by direct dialing
Dial(IAX2/@some_host_name/extension) or by referring to a section in
iax.conf Dial(IAX2/@[section]/extension) and the host names are not IP
addresses but DNS names, Asterisk does not care if the resolved address
changes.
In other words, lets say you have a dynamic DNS that translates to IP_1
and you use this in your configuration in Asterisk. If this IP changes
Asterisk would not respect it and keeps using the old IP until you reload.
It seems that Asterisk resolves the DNS and stores the IP in the memory
(as oppose to having the DNS entry and resolving it each time)
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 (0096595) mvanbaak (manager) - 2008-12-17 16:39
 http://bugs.digium.com/view.php?id=13900#c96595 
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ffadaie:

Sorry for not being verbose enough.
What you describe there is exactly what I was thinking about.

Right now, you set a refresh value in the configuration file, and
dnsmanager will only update the hostname:ip pair once every refresh_timeout
seconds.

What I want to do is alter dsnmanager to lookup everything needed, and
keep track of the TTL's for those records.
The timeout will be set to the lowest TTL of all the records.
If the TTL is reached, dnsmanager will refresh and do the whole 'store and
sort and use the lowest TTL' run again as part of the refresh function.
That way, if the TTL's changed, the refresh_timeout will be changed as
well.

Thanks for the feedback. 

Issue History 
Date Modified    Username       Field                    Change               
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2008-12-17 16:39 mvanbaak       Note Added: 0096595                          
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