[Dnsmasq-discuss] LAN taken down by Ubuntu upgrade - can't see problem

Simon Kelley simon at thekelleys.org.uk
Sun Jun 30 21:25:42 BST 2013


On 30/06/13 16:55, Adam Hardy wrote:
> adam.ant at cyberspaceroad.com on 6/29/2013 5:45 PM, wrote:
>> I upgraded the OS on my gateway machine which runs dnsmasq serving dhcp
>> and dns to the lan, and now the machines on my lan can't get an ip
>> address.
>>
>> With ubuntu, I run dnsmasq in a stand-alone mode, in contrast to the
>> ubuntu 'way' where the default installation installs dnsmasq and sets it
>> up for optimal desktop networking - which doesn't work well for a gateway
>> machine.
>>
>> My lan is on eth1, my modem is on eth0. Eth1 is assigned 192.168.0.3 by
>> /etc/network/interfaces, and this is what dnsmasq is configured to run
>> on.
>>
>> I hope you can give me a hint where to look next because as far as I am
>> aware, the only thing that changed was the ubuntu upgrade and I'm not
>> getting any help from the forum there, and my investigations with my
>> limited experience has run into the sand.[SNIP]
>
> OK problem solved, it was just my network hub that had on the blink and
> as it was buried under a mound of cables, I hadn't seen the blinking red
> light - strange co-incidence that it happened exactly as I did the
> ubuntu upgrade.
>
> Anyway, a question that arises from my investigations:
>
> I installed dhcping and running this command on the server with dnsmasq
> on 192.168.0.3 produces the response "no answer" - surely I probe the
> DHCP service from the same machine like that?
>

It's possible that the kernel or routing the dhcping request via the lo 
local interface, rather than via eth1, which is where dnsmasq is 
expecting to receive it.

Cheers,

Simon.

>
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