[Dnsmasq-discuss] dnsmasq on Ubuntu 14.04 and Network Manager

[Brian Watson]

Thanks! I went ahead and installed an independent copy and everything works
fine. I only needed it for dhcp functionality.

On Tue, Sep 29, 2015 at 12:50 PM, Dan Williams <dcbw at redhat.com> wrote:

> On Tue, 2015-09-29 at 09:04 -0500, Brian Watson wrote:
> > Hi,
> >    I had this working on Ubuntu 10.04, but now I would like to get it
> > working on 14.04 with a better understanding of what's happening. On
> 10.04
> > I installed dnsmasq without understanding that there was probably one
> > already installed as part of NetworkManager. With 14.04 I would like to
> > just use the version that's used by NetworkManager, but I didn't
> understand
> > the following:
>
> NM doesn't use a private on-disk copy of dnsmasq or anything, it uses
> the normal system copy that's already installed.  But it spawns a
> private *runtime* dnsmasq process to handle either (a) the local caching
> nameserver functionality, or (b) the internet connection sharing
> functionality.
>
> So it depends on what you want to use dnsmasq for; which one are you
> trying to do?  If it's internet connection sharing, then with the NM
> 0.9.8 in Ubuntu 14.04 you cannot change the address range handed to
> clients on the interface.  That has been fixed in NM 0.9.10 and later
> but even though that version is more than a year old, it is only
> included in Ubuntu 15.04.
>
> Typically you never really need to touch the dnsmasq that NM spawns,
> because modifications are usually done through the NM configuration not
> dnsmasq.  An independently installed and configured dnsmasq usually does
> not conflict with NetworkManager's copy, unless:
>
> 1) you have configured the independent copy to bind to the same
> interface/IP address that NetworkManager's copy is bound to, or you have
> allowed the independent copy to bind to all interfaces ("*") which
> obviously conflicts with the one NM spawns for interfaces it manages
>
> 2) you have enabled NM's local caching nameserver functionality and you
> have configured the independent copy to do the same thing
>
> In Ubuntu, NM and dnsmasq communicate via D-Bus, not through
> configuration files.  For internet connection sharing, NM spawns and
> kills its own copy for that specific interface.  For local caching DNS,
> I think the dnsmasq may be started by
>
> Dan
>
> > 1. The first thing I needed to do was to find the existing dnsmasq.conf
> so
> > that I could add my changes there and there is a version in
> > /etc/dbus-1/system.d/dnsmasq.conf
> >  2. dnsmasq.conf - it has XML type data in it related to busconfig with
> > some policies depending on the user.
> >  3. Can this file be modified so that I can add an interface with an
> > address range of IP addresses that I would like to use?
> >  4. If I install an independent version of dnsmasq does that interfere
> with
> > the NetworkManager one?
> >  5. Where is the NetworkManager one being started from? I looked in
> > /etc/init.d, but I didn't see anything for dnsmasq. I grepped the running
> > processes and it shows up as running.
> >
> > Best Regards,
> >    BW
> > _______________________________________________
> > Dnsmasq-discuss mailing list
> > Dnsmasq-discuss at lists.thekelleys.org.uk
> > http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
>
>
>
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