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On 18/05/2022 09:39, 
Nicolas Cavallari <<a href="mailto:nicolas.cavallari@green-communications.fr">nicolas.cavallari@green-communications.fr</a>>  wrote

<div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On 11/05/2022 13:41, Kamil via Dnsmasq-discuss wrote:<br>
> <br>
> But when I used isc-dhcp-server with following config:<br>
> <br>
>     subnet 192.168.6.0 netmask 255.255.255.0 {<br>
>              interface eth0;<br>
>              ddns-update-style none;<br>
>              default-lease-time 600;<br>
>              max-lease-time 3600;<br>
>              authorative;<br>
>              range 192.168.6.11 192.168.6.20;<br>
>              option subnet-mask 255.255.255.0;<br>
>              option routers 192.168.6.1;<br>
>              option domain-name-servers 8.8.8.8;<br>
>              get-lease-hostnames true;<br>
>              use-host-decl-names true; <br>
> <br>
>     }<br>
> <br>
> <br>
> then isc-dhcp-server assigns correct IP to RTMU86.<br>
> Why doesn't Dnsmasq want to assign IP to RTMU86?<br>
<br>
Your isc-dhcp-server config includes "authoritative" while your dnsmasq <br>
doesn't include "dhcp-autoritative".<br>
<br>
There isn't enough information to determine what is going on here, but<br>
I had problems with broken DHCP clients sending DHCPREQUEST without a <br>
server identifier option.<br>
RFC-compliant DHCP servers ought to ignore them, but authoritative mode <br>
is here to override this behavior.<br>
<br>
dnsmasq does not log anything in non-authoritative mode when it drops <br>
DHCP requests.<br></blockquote><div><br></div><div>
<div>Dear Nicolas,</div><div><br></div><div>I've tried 
 isc-dhcp-server without "authoritative" and it still work fine<br></div>  <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
If anything else fails, use tcpdump/wireshark.<br></blockquote><div><br></div><div>
<div><br></div><div>I've used tcpdump. I've attached full log in this message:</div><div><a href="https://www.mail-archive.com/dnsmasq-discuss@lists.thekelleys.org.uk/msg16249.html" target="_blank">https://www.mail-archive.com/dnsmasq-discuss@lists.thekelleys.org.uk/msg16249.html</a></div><div>please have a look.</div><div><br></div><div>Kind regards,</div><div>Kamil</div></div></div></div>