[Dnsmasq-discuss] ethers should have precedence over client dhcp request

richardvoigt at gmail.com richardvoigt at gmail.com
Sun Jul 5 22:02:10 BST 2009

aargh, gmail's deletion of the reply-to-all as default is driving me
crazy.  Resending:

Local settings do take precedence over options in the dhcp request,
but the content of /etc/ethers is cached in memory?  Did you send
dnsmasq a signal to ask it to re-read /etc/ethers?

On Sun, Jul 5, 2009 at 2:45 PM, Simon Kelley<simon at thekelleys.org.uk> wrote:
> Felix Schwarz wrote:
>> I have the situation that I changed the ip address in /etc/ethers. However
>> when the client sends a DHCPREQUEST with its old address (because the lease is
>> still valid) dnsmasq sends a DHCPACK and renews the lease. Therefore the
>> client could use the ip indefinitely. Is that correct or did I misinterpreted
>> my logs?
>> What I would like to see is that /etc/ethers has precedence over the lease
>> file. If a new DHCPDISCOVER / DHCPREQUEST comes in, dnsmasq should check the
>> ethers and offer only the ip address which is written there.
> That's the designed behavior: dnsmasq should send a DHCPNAK when a
> client has a defined IP address and the client renews a lease for a
> different address. The DHCPNAK will force the client to go through the
> whole DISCOVER/REQUEST cycle.
> I suspect that your problems with duplicate IP addresses in /etc/ethers
> may have confused this, but if you have a clear case where it's not
> working, please let me have details and I'll check it out as a possble bug.
> Cheers,
> Simon.
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