[Dnsmasq-discuss] Ignoring unknown clients in Proxy DHCP mode?

Simon Kelley simon at thekelleys.org.uk
Tue Sep 1 20:14:12 BST 2009

Niels Basjes wrote:
> Hi Richard,
>>> I would like to run a Proxy DHCP (PXE) server next to the corporate DHCP server.
>>> I would also like the Pxory DHCP to ONLY respond to "my" systems and
>>> ignore everyone else.
>>> So I tried this config:
>>> domain=lan.basjes.nl,
>>> dhcp-range=,proxy
>>> dhcp-host=00:0c:29:99:4E:92,pxetest
>>> dhcp-ignore=#known
>>> pxe-service=x86PC, "Boot PXElinux", pxelinux
>>> The booting works fine .... for EVERY client.
>>> How do I correctly do the ignoring?
>> pxe-service=net:known, x86PC, "Boot PXElinux", pxelinux
> I tried our suggestion.
> The effect of this is that the client DOES receive some boot
> information. Only the menu item is held back.
> I checked with wireshark and it seems that an 'empty' PXE menu is returned.
> The VMware Server bios fails with "PXE-E76: Bad or missing multicast
> discovery address".
> Your suggestion does mean I can create tags for groups of clients and
> customize the menu by hiding/showing options. Very usefull  feature
> for the future.
> I've also tried this:
> domain=lan.basjes.nl,
> dhcp-range=net:known,,proxy
> dhcp-host=00:0c:29:99:4E:92
> dhcp-ignore=#known
> dhcp-boot=net:known,pxelinux.0
> But that had the same effect as
> pxe-service=net:known, x86PC, "Boot PXElinux", pxelinux


Please could you download and try


which should work OK with the first configuration you tried.



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