On 14 Dec at 09:59, Community support for Fedora users <users@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> On Wed, 2021-12-15 at 00:37 +1000, Michael D. Setzer II:
> > Just to clarify. dyndns.org only links my sites name to the
> > public IP address I get from ISP. Has been the same exact
> > IP for at least 2 years, but is a static one?? But works
> > fine.
>
> If they don't advertise it as static ("that's a feature!") it probably
> isn't. It's highly likely that they set the lease on the IP with a
> reasonable time period so that you're going to get the same IP if you
> temporarily disconnect for a short period. You may get the same one if
> you disconnected for a longer period, but there's probably some time
> period where you lose the lease and get a different IP.
Most ISPs actually don't use DHCP as DHCP, _per se_; they're using it as an
IP address management tool. You will usually get, and keep, a particular IP
address almost indefinitely.
UNLESS you replace the cable modem, in every case I've seen for clients.
Some ISPs also trigger a reassignment if the cable modem is reset.
For that reason, even if it never seems to change, *don't* count on your IP
being "static"--it's more "pseudo-static", but can change at the whim of
the ISP. Using a dynamic DNS service such as dyndns.org, freedns.org, etc.
is wise and recommended in such a case.
Cheers,
--
Dave Ihnat
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