[Dnsmasq-discuss] Cannot obtain IP address from dnsmasq

Matwey V. Kornilov matwey.kornilov at gmail.com
Fri Jun 24 10:10:53 BST 2016


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?




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