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Re: Mixing and Matching DHCP and static IPs




On Mon, Dec 25, 2017 at 08:25:52PM -0600, Paul Johnson wrote:
> On Mon, Dec 25, 2017 at 10:49 AM, Marc Auslander <marcslists@xxxxxxxxx>
> wrote:
> 
> > The safest way to fix an ip address in a dhcp served network is to tell
> > the dhcp server to associate that address with the mac of the unit.  The
> > address should be outside the dhcp range you set up.  I normall pin down
> > all my connected devices that way, leaving the dhcp assignment for
> > guests etc.  I've never seen a router which didn't support this.
> >
> >
> Or, just tell the DHCP server that you want a specific MAC address to
> always be assigned to a specific IP address.  It doesn't matter if it's in
> or out of the assignment range, then, or whether or not the unit in
> question understands DHCP or is configured manually on it's end; the DHCP
> server will not assign another client to that IP.  Though for ease of
> dealing with static assignments, I personally find it much simpler to do it
> all at the DHCP server end only if the client end speaks DHCP, just in the
> off chance I need to change the network configuration later.


Sample dhcpd config for a static IP assignment:

host thatonemachine {
 hardware ethernet d0:ee:fb:13:5e:a6;
 fixed-address 192.168.0.64;
}

You can read the ethernet MAC address on the machine in question
with 
ip l | grep ether

-dsr-