[Dnsmasq-discuss] dnsmasq not working as DNS server for client machines

[Dave Taht]

On May 22, 2014 3:37 PM, "Chris Green" <cl at isbd.net> wrote:
>
> On Thu, May 22, 2014 at 11:08:22PM +0100, Chris Green wrote:
> > On Thu, May 22, 2014 at 10:46:46PM +0100, Chris Green wrote:
> > > I seem to have spoken too soon with my transfer of dnsmasq to a
> > > different machine.
> > >
> > > It's running on my desktop machine which is also an always on server.
> > > DNS is working fine for the desktop machine itself but it's not
> > > working for client machines.
> > >
> > > DHCP is working though, so clients get an IP address OK and can talk
> > > to other machines on the LAN if I specify IP addresses rather than
> > > names.
> > >
> > > So how do I diagnose this?  It's on xubuntu 14.04 so it's made a
> > > little opaque by not being able view 'real' DNS servers anywhere
> > >
> > Sorry about that abrupt end.  Not much to add though.
> >
> > As a general comment it would be very useful to be able easily to see
> > what DNS servers are being used.
> >
> ... a little more information.  DHCP clients are getting all the right
> information, e.g. the laptop I'm using at the moment has:-
>
>     IP Address:         192.168.1.125
>     Broadcast Address:  192.168.1.255
>     Subnet Mask:        255.255.255.0
>     Default Route:      192.168.1.1
>     Primary DNS:        192.168.1.4
>
> The default route is an ADSL router and the primary DNS is my desktop
> server machine running dnsmasq.  So it would appear that dnsmasq isn't
> answering DNS queries rather than it's not doing DHCP correctly.
>
> It's almost certainly a trivial configuration problem but I can't see
> it at the moment.

Tcpdump is your friend.

>
> --
> Chris Green
>
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