[Dnsmasq-discuss] Change upstream server by client?

[Geert Stappers]

On Thu, Dec 29, 2022 at 05:34:24PM -0500, Jonathan Stafford wrote:
> On Thu, Dec 22, 2022 at 3:46 PM Michael Smith <michael at kmaclub.com> wrote:
> 
> > I run 2 instances of pihole (DNSmasq) on docker.   Each run on their own
> > IP address (macvlan) separate from the docker host.   Their IP addresses
> > are .2 and .3.
> >
> >
> > The .2 host is primary and forwards upstream to 1.1.1.1.   This container
> > also holds all the hosts file info and handles DHCP+dynamic host DNS
> > resolution.
> >
> > The .3 host is secondary and handles only DNS requests for the kids.
> > This forwards upstream to 1.1.1.3.    If  a DNS request comes in for local
> > domain info, it simply forwards those requests to .2 like this:
> >
> > server=/mydomain.com/192.168.101.2
> > server=/101.168.192.in-addr.arpa/192.168.101.2
> >
> >
> > Combine with the tagging and now you can point any client to either
> > upstream DNS:
> >
> > # Define DNS servers
> > dhcp-option=option:dns-server,192.168.101.2
> > dhcp-option=tag:kidsdevices,option:dns-server,192.168.101.3
> >
> > dhcp-host=0c:51:01:95:d3:36,set:kidsdevices   # Ipad
> > dhcp-host=58:41:4E:CD:D2:0A,set:kidsdevices   # Iphone
> >
> 
> Thanks everybody for the discussion.  I ended up doing something like what
> Michael and Geert described and adding a second IP to my server and running
> two instances of dnsmasq.
> 
> The primary instance handles DHCP, uses 1.1.1.2 as its upstream, and tags a
> handful of devices to use it for DNS:
> 
> no-resolv
> server=1.1.1.2
> interface=lo
> interface=eth0      # 10.1.1.32
> bind-interfaces
> dhcp-host=1c:0d:7d:13:9e:3e,set:cf1112
> dhcp-option=option:dns-server,10.1.1.33
> dhcp-option=tag:cf1112,option:dns-server,10.1.1.32
> 
> The secondary instance is just doing DNS and using 1.1.1.3 as its upstream:
> 
> no-resolv
> server=1.1.1.3
> interface=eth0:1    # 10.1.1.33
> except-interface=lo
> no-dhcp-interface=eth0:1
> bind-interfaces
> 

How are those solutions ( "docker" and "IP alias") started when the host
reboots.  Is the %i 
of https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q4/016771.html
being used?


Groeten
Geert Stappers
-- 
Silence is hard to parse