[Dnsmasq-discuss] Cannot obtain IP address from dnsmasq

[Albert ARIBAUD]

Hi Matwey,

Le Fri, 24 Jun 2016 12:10:53 +0300
"Matwey V. Kornilov" <matwey.kornilov at gmail.com> a écrit:

> Hello,
> 
> I am running dnsmasq-2.71 and experiencing the following issue.
> 
> I have network interface eth3 with 10.3.0.1/24 address assigned to
> it. I want dnsmasq instance to supply everyone on eth3 L2-segment
> with IP address from 10.3.0.1/24 subnet. I don't want DHCP be running
> on other interfaces where it can interfere others.
> 
> The issue is the following, HP commutator can not obtain address.
> 
> 12:03:01.609174 IP 192.168.1.1.68 > 255.255.255.255.67: BOOTP/DHCP, 
> Request from 40:a8:f0:6f:64:40, length 256
> 12:03:23.952477 IP 192.168.1.1.68 > 255.255.255.255.67: BOOTP/DHCP, 
> Request from 40:a8:f0:6f:64:40, length 256
> 
> At the same time, other devises obtain address successfully:
> 
> 12:03:45.311101 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP,
> Request from 44:aa:e8:00:0c:4e, length 249
> 12:03:45.313634 IP 10.3.0.1.67 > 255.255.255.255.68: BOOTP/DHCP,
> Reply, length 300
> 12:03:45.340273 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP,
> Request from 44:aa:e8:00:0c:4e, length 256
> 12:03:45.371271 IP 10.3.0.1.67 > 255.255.255.255.68: BOOTP/DHCP,
> Reply, length 300
> 12:03:45.395392 IP 10.3.0.33.1025 > 239.255.255.250.1900: UDP, length
> 320 12:03:46.884261 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP,
> Request from 44:aa:e8:00:0c:46, length 249
> 12:03:46.885707 IP 10.3.0.1.67 > 255.255.255.255.68: BOOTP/DHCP,
> Reply, length 300
> 12:03:46.911271 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP,
> Request from 44:aa:e8:00:0c:46, length 256
> 12:03:46.945596 IP 10.3.0.1.67 > 255.255.255.255.68: BOOTP/DHCP,
> Reply, length 300
> 12:03:46.968662 IP 10.3.0.32.1025 > 239.255.255.250.1900: UDP, length
> 320 12:03:50.390213 IP 10.3.0.33.1025 > 239.255.255.250.1900: UDP,
> length 320
> 
> I suppose, that the issue here is that HP's source address is 
> 192.168.1.1, how could I configure dnsmasq to overcome this issue?

The above is a tcpdump log. What does dnsmaq itself log? Think of
adding the log-dhcp option to the dnsmasq config file beforehand.

Amicalement,
-- 
Albert.