[Dnsmasq-discuss] Multiple subnets question

[Hartmut Krafft]

Hi Chris,

On July 8, 2015 12:40:19 Chris Green <cl at isbd.net> wrote:

> I have a small[ish] home network with dnsmasq running on a Raspberry
> Pi doing the standard stuff on the main subnet.  I'm wondering if I
> can get dnsmasq to handle DHCP and local DNS for two other subnets as
> well.
>
> I'll try and describe the setup:-
>
>     The 'main' router is a Draytek Vigor 2820n which also provides
>     ADSL to the internet.  The LAN subnet is 192.168.1.xx and (with
>     the addition of some switches) most of my hardware is connected to
>     this subnet and, as I said, dnsmasq runs on a Raspberry Pi on this
>     subnet.
>
>     Theres a second ADSL router connected to a second phone line for
>     redundancy/backup, this router's LAN side is 192.168.13.xx and
>     connects to the wired WAN connection on the 2820n.  The 2820n does
>     load-balancing/fail-over etc.
>
>     A simple Tenda W311R+ wireless router is also connected to the
>     192.168.1.xx subnet (i.e. its WAN connection is on that subnet)
>     and provides WiFi in areas where the signal doesn't reach from the
>     2820n.  The LAN side of this router is 192.168.0.xx.
>
>
> So, at present, any computer that uses the WiFi signal from the 2820n
> gets a 192.168.1.xx address assigned by dnsmasq and it is also
> accessible by name.  I'd like to be able to do this for computers that
> use the W311R+ WiFi signal.  Can dnsmasq do this?
>
> Is it possible to somehow tell a router (the W311R+) to pass DHCP
> requests on to its WAN side and then get dnsmasq to assign an IP in
> the correct range for the W311R+.

>From the top of my mind: Set the "LAN"side of the W311 to the same subnet 
as the rest, don't use the "WAN" port, connect the cable to the "LAN"port. 
DHCP broadcasts should reach dnsmasq if the WiFi and LAN ports are bridged.

Best,
Hartmut


>
> ... or am I going about this in the wrong way?
>
> --
> Chris Green
>
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