[Dnsmasq-discuss] Change upstream server for client

[Geert Stappers]

On Sun, Dec 18, 2022 at 11:10:21AM -0500, Jonathan Stafford wrote:
> 
> On Sun, Dec 18, 2022 at 10:36 AM Michael Smith <michael at kmaclub.com> wrote:
> 
> > On 12/18/22 06:59, Jonathan Stafford wrote:
> > 
> > > prequel, completely made up:
> > > > 
> > > > LAN is 192.168.6.0/24
> > > > Dnsmasq is at 192.168.6.10
> > > > DHCP range is at 192.168.6.100 - 192.168.6.150
> > >
> > > --server provides a way to change upstream resolvers based on the domain
> > > being queried.  Is there a way to make the same sort of change based on the
> > > client doing the querying?  For example, I'd like the IP address range I
> > > use for my kids' devices to use 1.1.1.3.
> >
> > You can achieve this using tags:
> >
> > # Define DNS servers
> > dhcp-option=option:dns-server,1.1.1.1
> > dhcp-option=tag:kidsdevices,option:dns-server,1.1.1.3
> >
> >
> > dhcp-host=0c:51:01:95:d3:36,set:kidsdevices   # Ipad
> > dhcp-host=58:41:4E:CD:D2:0A,set:kidsdevices   # Iphone
> >
> Thanks, Michael.  That will work to get them using that server, but it's
> totally bypassing dnsmasq which means my local entries from /etc/hosts
> don't resolve.  I'd like both things to work to be difficult :)

Something more difficult as making reading in the discussion order
possible:

* Make dnsmasq bind to 127.0.0.1 and 192.168.6.10 only
* Add an IP alias  192.168.6.17 to the dnsmasq server
* Create an second dnsmasq.conf
  * bind only to 192.168.6.17
  * upstream DNS 192.168.6.10

In the main dnsmasq.conf

 # Define DNS servers
 dhcp-option=option:dns-server,192.168.6.10
 dhcp-option=tag:kidsdevices,option:dns-server,192.168.6.17

 dhcp-host=0c:51:01:95:d3:36,set:kidsdevices   # Ipad
 dhcp-host=58:41:4E:CD:D2:0A,set:kidsdevices   # Iphone


No tested, so test it yourself.
Karma bonus points for reporting back with reply below the relevant text.


Groeten
Geert Stappers
-- 
Silence is hard to parse