[Dnsmasq-discuss] client q: both static and dhcp

Carl Karsten carl at nextdayvideo.com
Sun Jun 27 06:26:24 UTC 2021

These machines are portable. they will likely start out on a lan where I
control the dhcp server;  the os apps and config are setup, then they are
moved to another room.   They live there for a few days to a week, and then
are put back in storage, with a few being left out for R&D to experiment

There isn't always a dhcp server on the network.  Sometimes there isn't
even a network with the exception of a single run of cat 5 between 2

This is what is going on:

Sometimes there isn't a link to "DHCP – Gigabit feed out" (thus there is no
live stream, just recording to local disk)

This is what I want the static IP for:
The "Opsis PC" has a systemd script that connects to "Voctomix PC"
The script uses a hostname, the hostname is set in /etc/hosts

If there is a network with dhcp, then it will be nice to get the gateway
and be able to ssh into machines.

On Sun, Jun 27, 2021 at 12:03 AM Dominik <dl6er at dl6er.de> wrote:

> Hey Carl,
> On Sat, 2021-06-26 at 19:16 -0500, Carl Karsten wrote:
> > I'm looking for advice on haveing some boxes to have both dynamic and
> > static IPs.
> Why use a static IP at all? We have often enough seen people use static
> addresses for the wrong reasons.
> Consider using only DHCP and
> (a) use a hostname to access the device. In the end, memorizing some-
> service.lan is more reliable than You may think
> differently, but let's see what you say after not having logged into
> the box for half a year - do you still know the address without looking
> it up? However, you may still recall a good hostname.
> (b) use a deterministic DHCP server like dnsmasq. It always tries to
> assign the same IP addresses to the same devices (instead of numbering
> them sequentially based on their appearance like cheap routers often
> do).
> Using (a), (b) or (a)+(b) doesn't require you to have a static IP at
> all.
> Best,
> Dominik

Carl K
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