Data Control Systems - Mike Elkevizth wrote:
Hi,
I have recently scrapped my Bind/DHCPd installation after a server crashed
and not wanting to go through all the trouble setting up the new one. All
seems to work well except that I can not figure out how to get one server
running dnsmasq to return an address from another. I have one domain
comprised of three subnets connected through a VPN. I would like to have
each server be able to return all the addresses that all the servers have
assigned via DHCP. For instance if server A assigns workstation Z an address
and server B assigns workstation Y an address, I would like server A or B to
be able to respond to a dns query for either workstation Y or Z. I'm sure
this should be able to be done through forwarding, but I can't figure out
how to make dnsmasq forward the requests and then respond properly. I tried
just adding the all the dnsmasq servers to all the workstations as dns
servers, but the local server must be responding with something which makes
the workstation not use the other server. I'm sure I just have an option
setup wrong, but If anyone could help point it out, I would be very
appreciative.
It is possible to configure multiple instances of dnsmasq the way you
want, but it's probably not the best way to achieve the global goal.
It's much better to have _one_ instance of dnsmasq and let it handle
DHCP and DNS for all three subnets. If you have a machine which has
interfaces on all three subnets then this is very easy: just provide
dnsmasq with three "dhcp-range" options, one for each network. It will
do everything else automagically.
If all three networks _don't_ meet on one router, then you will need to
run a DHCP-helper on the ones which are remote from dnsmasq. Real IP
routers (CISCO etc) normally have this facility. or you can use the ISC
DHCP-relay, or DHCP-helper
http://www.thekelleys.org.uk/dhcp-helper
Just run the helper on a machine with an interface on the network in
question, and tell the helper to send DHCP requests to the machine
running dnsmasq.
HTH
Simon.
