[mrtg] MRTG and DynDNS

Guenther Boelter gboelter at gbsconsult.net
Tue Sep 4 11:14:25 CEST 2007

Thanks Alex,

looks like it's really a problem with MRTG.

If nobody has a better idea, I will try to run MRTG via cron instead as
a daemon.

Let's see ....

Alex van den Bogaerdt wrote:
> On Tue, Sep 04, 2007 at 02:38:22PM +0800, Guenther Boelter wrote:
>> I have an agent/client with a dynamic IP address using dyndns.org. At
>> the moment the IP address for the client has changed MRTG can't get
>> datas anymore from that client because MRTG is still using the old ip.
> Is MRTG, or is your entire system?
> Perhaps you've just found out about DNS caching...
> http://en.wikipedia.org/wiki/Domain_name_system#Caching_and_time_to_live
> I'm not saying that it certainly is not mrtg, I don't know, but I
> could think about a couple of other places where things could go wrong.
> I hope someone else can give a more definitive answer but in the mean
> time you could try to narrow down the problem area.  Some tools will
> use the DNS resolver (and return cached data) some will bypass it and
> return the new IP address.  Maybe a small perl program would do, one
> pinging the host one time and thus showing the IP address.
> Alex
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