[Ddclient-forum] [ ddclient-Bugs-2451365 ] Suspect min-interval for DynDNS

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Bugs item #2451365, was opened at 2008-12-19 15:14
Message generated for change (Comment added) made by ziesemer
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Category: service configuration
Group: current version
Status: Closed
Resolution: Invalid
Priority: 5
Private: No
Submitted By: Mark Ziesemer (ziesemer)
Assigned to: wimpunk (wimpunk)
Summary: Suspect min-interval for DynDNS

Initial Comment:
Partially related to feature request # 2451138.

Looking at line 357 in rev. 78 of ddclient, the "min-interval" variable is defaulted to 30 seconds.  The configuration for DynDNS doesn't appear to reset this.  Also, as far as I can tell, DynDNS doesn't require or at least doesn't specify this value.  Some quick testing shows that DynDNS accepts almost immediate, successive updates, as long as it results in an IP change.

As far as I can tell, this option is not user-configurable from the config file nor the command line.

One point still not fully considered is that, at least for free users, DynDNS only offers TTLs of 60 seconds or 4 hours.  It could be assumed that min-interval should also then be 60 seconds.  However, in a worst-case scenario, DynDNS could require waiting 60 seconds to update, plus another 60 seconds could be required for the TTL to expire, resulting in a maximum of 2 minutes necessary for the change to be reflected.  Allowing a min-interval of 0 for DynDNS would lower this time to the TTL value.  It would also resolve the situation detailed in feature request # 2451138, without requiring additional complexities, as long as DynDNS does truly not have a stated or enforced minimum update interval.

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>Comment By: Mark Ziesemer (ziesemer)
Date: 2008-12-20 10:54

Message:
I'm not disputing that ddclient doesn't meet the DynDNS requirements.  I
believe it not only does, but is doing more than needed, as I tried to
describe.

I will review the latest SVN version and will follow-up to the forum as
requested if needed.

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Comment By: wimpunk (wimpunk)
Date: 2008-12-20 07:09

Message:
Please first discuss issues on the forum and use the latest svn version to
verify your theory (currently r106).  Read the developper API and put links
to the correct paragraphs.  Ddclient has been verified and modified for and
by dyndns to fit their requierements. 

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=676128&aid=2451365&group_id=116817