[Dnsmasq-discuss] dhcp-host precedence request due multiple matches

Jesus M Diaz jesusm.diazperez at gmail.com
Mon Jun 21 07:05:03 UTC 2021


Not an answer, actually.

- *Avoid multiple matches*. As explained in the 'scenario description',
that's not possible in this case, but moreover, there might be other
scenarios where it wouldn't be possible either.

- *My point of view:   Each computer has a (dnsmasq) DNS entry, the entry
gets in DNS by DHCP of dnsmasq*. What a computer is? the physical instance
or the virtual one? the hardware or the software? This is the key to my
scenario. And I totally agree with you: each computer should have one
entry, the problem is the definition of 'each computer'.

So, regardless of your opinion about the scenario being logical, making
sense of being valid/invalid, the question stands: is there any way to
define precedences for potentially multiple matches?

Thanks.
Jesus M Diaz


On Sun, 20 Jun 2021 at 22:50, Geert Stappers via Dnsmasq-discuss <
dnsmasq-discuss at lists.thekelleys.org.uk> wrote:

> On Sun, Jun 20, 2021 at 08:58:59PM +0100, Jesus M Diaz wrote:
> > Hello,
> >
> > Let me explain the scenario:
> >
> > - I have a number of computers acquiring IP-address by DHCP and I have
> > dnsmasq configured with static leases for specific mac-addresses.
> > - I also have a couple of virtual computers for very specific purposes
> that
> > I run from a live Linux distro from a USB drive. Physically I can run
> them
> > on any of my 'physical' computers.
> >
> > Now the problem and questions:
> >
> > - I configured the virtual-usb computers to present themselves with
> > specific hostnames.
>
> OK
>
> > - I configured dnsmasq to assign an ip-address based on the hostname, and
> > it works fine ... *IF AND ONLY IF* I don't have a specific mac-address
> > based dhcp-host entry.
>
> OK
>
>
> > Apparently when I have more than one dhcp-host entries matching the DHCP
> > request, the mac-addr based one is the preferred one. I've tried
> > configuring it in different order but always the mac-addr based is the
> > chosen one.
> >
> > So, my question:
> > is there any way to set up the precedence of the dhcp-host entry
>
> Triggered by  "the dhcp-host entry", a snippet from manual page of dnsmasq:
>
>  dhcp-host=[<hwaddr>][,id:<client_id>|*][,set:<tag>][tag:<tag>][,<ipaddr>][,<hostname>]
>
> In other words: "the dhcp-host entry" has many many meanings.
>
>
> > in case more than one match the DHCP request?
>
> What avoiding the multiple matches?
>
>
>
> And what is the actual problem? As in:  Why the question?
>
> My point of view:
>   Each computer has a (dnsmasq) DNS entry,
>   the entry gets in DNS by DHCP of dnsmasq.
>
>
>
> Regards
> Geert Stappers
>
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>
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> --
> Silence is hard to parse
>
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