Re: Dynamic DNS services and other DNS contortions

On Wed, 21 Feb 2007, Theo Markettos wrote:

TM> I have a few machines with dynamic IP addresses that I want fixed domain
TM> names for. I know there are lots of dynamic DNS services out there, but
TM> most I've tried expire after a month or so. This is annoying because the
TM> machines in question might be switched off for 6 months or more, so I can't
TM> guarantee any cron job on them is going to renew the address.
TM>

Can you not have an always switched on machine udating the dymamic DNS so
that all the names point to its ip; eg, alwayson,example.com,
sometimesoff1.example.com, sometimesoff2.example.com all have
81.187.211.42

Then, you switch on another machine, the real sometimesoff.example.com.
That updates the dynamic dns for its name in its startup files and cron so
that sometimesoff.example.com is now 81.187.211.43

Meanwhile, back at the permanent machine, it is about to run its cron to
update dynamic dns. But first it checks to see if
sometimesoff.example.com still has the same ip as itself, that is, do
sometimesoff.example.com and alwayson.example.com have the same ip. If
not, don't update.


--
Alan

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