[Dnsmasq-discuss] Setting dnsmasq to serve multiple subnets

[Michael Smith]

On 4/28/22 09:20, Will Dennis wrote:
>
> Hi all,
>
> I currently have dnsmasq set up and working well for the LAN that the 
> dnsmasq server is on (for our purposes, say 192.168.0.0/24.) Config is 
> like this currently:
>
>
> Now, I have now set up a router (layer-3 switch) that has interfaces 
> to multiple other networks off of it, all having a /28 network mask. 
> It has been set to be a DHCP relay (“ip helper”) pointing DHCP 
> requests from these new networks to the dnsmasq server. I cannot seem 
> to find a “howto” on how to configure dnsmasq to serve multiple dhcp 
> pools/associated options so it can be the single DHCP/DNS server for 
> these multiple new networks. In my reading of the man pages, I 
> **think** I’d have to do something like this in my config to enable this:
>
> domain-needed
>
> bogus-priv
>
> strict-order
>
> no-hosts
>
> dhcp-authoritative
>
> dhcp-leasefile=/var/lib/misc/dnsmasq.leases
>
> domain=nec-labs.com
>
> dhcp-range=192.168.0.20,192.168.0.59,1h
>
> dhcp-option=option:router,192.168.0.1
>
> dhcp-range=set:vlan10,192.168.1.1,192.168.1.13,255.255.255.240,1h
>
> dhcp-option=tag:vlan10,option:router,192.168.1.14
>
> […]
>
> Am I correct in this? And, I don’t need to tag the original 
> pool/options, do I?
>
>

Here is what I have in my config for multiple subnets and directing 
various services.  I am running dnsmasq on a seperate host in the lan 
subnet.  I tag even the default lan for clarity.


# Subnet specific delarations
dhcp-range=lan,192.168.101.100,192.168.101.200,96h
dhcp-range=IOT,192.168.102.100,192.168.102.200,96h
dhcp-range=guest,192.168.103.100,192.168.103.200,72h
dhcp-range=camera,192.168.104.100,192.168.104.200,72h

# Define router
dhcp-option=tag:lan,option:router,192.168.101.1
dhcp-option=tag:IOT,option:router,192.168.102.1
dhcp-option=tag:guest,option:router,192.168.103.1
dhcp-option=tag:camera,option:router,192.168.104.1

# Define DNS servers (DNSmasq server - also DHCP)
dhcp-option=option:dns-server,192.168.101.2

# Define NTP servers
dhcp-option=tag:lan,option:ntp-server,192.168.101.1
dhcp-option=tag:IOT,option:ntp-server,192.168.102.1
dhcp-option=tag:guest,option:ntp-server,192.168.103.1
dhcp-option=tag:camera,option:ntp-server,192.168.104.1


# Common definitions
dhcp-option=option:netmask,255.255.255.0
dhcp-option=15,"mydomain" # Domain name
dhcp-option=101,America/Denver



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