[Dnsmasq-discuss] Dnsmasq not answering DHCP requests

[richardvoigt at gmail.com]

On Sat, Feb 6, 2010 at 1:53 AM, Robert Pollai <robert.pollai at gmx.at> wrote:
> Hi Richard,
>
> Thanks for your reply!
>
>> Is dnsmasq running on the router where the old DHCP software was?  A
>> separate computer?  Connected how to the network? (e.g. dnsmasq is
>> wired to the router, clients are a mix of wired and wireless)
>
> The previous DHCP server was a router appliance from Linksys. Dnsmasq
> I run on a NAS from Synology (DS408) with an PPC processor running Linux.
> I compiled dnsmasq there myself. The NAS is wired to the router and all
> clients I tested so far are wired to the router as well.
>
>> What OS?  Could be a firewall/packet filtering issue on either the
>> dnsmasq computer or the router. (e.g. router firewall is configured to
>> accept DHCP requests but not bridge them to the rest of the network)
>
> I also tested a client that is connected directly to the NAS via a switch,
> So there is no firewall between. The firewall on the NAS is disabled.
>
>> Make sure that dnsmasq owns port 67 on its machine by running "netstat
>> -l" with dnsmasq running and again with dnsmasq stopped.
>
> I did that and dnsmasq has port 67 (shown as "bootps") and also 53 (shown
> as "domain") for DNS. I tested DNS and it works for machines I have in my
> /etc/hosts (after I commented no-hosts out of the config file). The DNS
> does not work for the names I put in via the dhcp-host entries.

This sounds as if some other DNS and DHCP server programs are running.
 Or perhaps dnsmasq is running and owns the ports, but is reading from
a different configuration file (path can be specified on the
command-line, there's also a compiled-in default).

How are you starting dnsmasq?  Does it behave differently if you run
it from a root command-line instead of through init scripts?

>
> Kind regards, Robert
>
> -----Original Message-----
> From: richardvoigt at gmail.com [mailto:richardvoigt at gmail.com]
> Sent: 05 February 2010 23:47
> To: rap.nospam2 at gmx.net
> Cc: dnsmasq-discuss at lists.thekelleys.org.uk
> Subject: Re: [Dnsmasq-discuss] Dnsmasq not answering DHCP requests
>
> On Fri, Feb 5, 2010 at 3:24 PM,  <rap.nospam2 at gmx.net> wrote:
>> Hi,
>>
>> I am new to dnsmasq and want to replace my routers DHCP with it. So I just tried to create my first setup but unfortunately it seems that dnsmasq is not answering DHCP requests, my clients requests are timing out.
>>
>> I would appreciate any hints on what I could have done wrong or generally on how to approach/debug the issue.
>
> Is dnsmasq running on the router where the old DHCP software was?  A
> separate computer?  Connected how to the network? (e.g. dnsmasq is
> wired to the router, clients are a mix of wired and wireless)
>
> What OS?  Could be a firewall/packet filtering issue on either the
> dnsmasq computer or the router. (e.g. router firewall is configured to
> accept DHCP requests but not bridge them to the rest of the network)
>
> Make sure that dnsmasq owns port 67 on its machine by running "netstat
> -l" with dnsmasq running and again with dnsmasq stopped.
>
>>
>> Here is my config file:
>>
>> - file start -
>>
>> # Configuration file for dnsmasq.
>> #
>>
>> dhcp-range=192.168.0.100,192.168.0.150,12h
>> dhcp-leasefile=/var/packages/dnsmasq/target/leases/dnsmasq.leases
>> dhcp-authoritative
>>
>> no-resolv
>> no-hosts
>>
>> server=(ip deleted)
>> server=(ip deleted)
>> server=(ip deleted)
>>
>> dhcp-option=option:router,192.168.0.1
>>
>> dhcp-host=(mac deleted),adam,192.168.0.100
>> dhcp-host=(mac deleted),eva,192.168.0.101
>>
>> - file end -
>>
>> Kind regards, Robert
>>
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>>
>
>
>