[Dnsmasq-discuss] Do "proxy-DHCP" without PXE

[Steven Maddox]

Hi Simon,

I didn't know about that, I'll take a look at it.

But I have a feeling that it's not what I'm after, as the scenario I'm 
talking about doesn't involve any PXE clients.  See the example scenario 
I gave before where I referred to a Polycom phone.

Steven Maddox
Lantizia

On 28/04/2025 19:52, Simon Kelley wrote:
> The latest release, 2.91, includes a new option --dhcp-option-pxe, which 
> may be of use here.
> 
> Cheers,
> 
> Simon.
> 
> 
> On 28/04/2025 13:32, Steven Maddox wrote:
>> Hello,
>>
>> Sorry if what I'm about to ask is impossible, but I just really needed 
>> to know one way or another.
>>
>> I find dnsmasq such a handy utility for all kinds of situations (so 
>> huge thanks for creating it!)... one such situation was back when I 
>> was working with ThinStation and I'd do something like this to quickly 
>> test how a new build would boot on some PXE enabled machines...
>>
>> dnsmasq -d -i enp2s0 -F192.168.1.0,proxy --enable-tftp --tftp- 
>> root="$(pwd)/build/boot-images/pxe" -p0 --log-dhcp --pxe- 
>> service=x86PC,'Network Boot',boot/lpxelinux/lpxelinux
>>
>> Ultimately it's the "proxy-DHCP" that I'm focussing on here.
>>
>> Would it be possible to use this technique to add extra arbitrary DHCP 
>> options to a reply instead?  without touching the config of the 
>> authoritative "other" DHCP server? e.g...
>>
>> dnsmasq -d -i enp2s0 -F192.168.1.0,proxy --enable-tftp --tftp- 
>> root="$(pwd)" -p0 --log-dhcp -O 160,tftp://192.168.1.2
>>
>> This would be really handy in a scenario where you need to tell a 
>> bunch of devices (e.g. Polycom phones) a new provisioning URL (in that 
>> example option 160) on a temporary basis whilst you 
>> reboot/factory-reset them. Especially when you're stuck using whatever 
>> existing DHCP server is on the network with no ability (or great 
>> difficulty) to reconfigure it.
>>
>> But I have a feeling I'm going to be told that "proxy-DHCP" is, and 
>> can only be, a PXE specific thing?  if so, what is that?
>>
>> Thanks
>>
> 
> 
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