[Dnsmasq-discuss] question about --dhcp-hostsfile

[Shashank Shanbhag]

Hi,

I am trying to set up a virtual network (VMs run on KVM) with different VMs
running on different vlans. For each network, I have precomputed the mac:ip
mappings and written to a dhcp-hostsfile specific to that network.

For example, for "--dhcp-range=174.0.140.10,174.0.140.200", I have the
following: "--dhcp-hostsfile=/var/run/_root_root_vdhcpd200.dhcp_hosts.cfg"

Similarly, for the other network, I start a different dnsmasq process that
serves a different range and has a different dhcp-hostsfile that it looks
up.

The dhcp-hostsfile entries are of the following format:
mac-addr1,ip1,lease
mac-addr2,ip2,lease
mac-addrn,ipn,lease

However, dnsmasq still allocates a random IP from the range overriding
anything stored in the dhcp-hostsfile. The logs show that dnsmasq gets the
right mac address, but allocates a random IP.
I've also tried it with the end-address in the --dhcp-range set to
'static'. In that case, the VM ends up without an IP.

dnsmasq runs with the following options:

/usr/sbin/dnsmasq --conf-file=/var/tmp/dnsmasq.dummy.conf
--dhcp-hostsfile=/var/run/_root_root_vdhcpd100.dhcp_hosts.cfg
--pid-file=/var/run/_root_root_vdhcpd100.dnsmasq.pid --bind-interfaces
--except-interface=lo --listen-address=192.168.0.76 --dhcp-option
option:dns-server,192.168.0.5,192.168.0.6 --dhcp-option
option:router,192.168.0.1 --dhcp-range=192.168.0.10,192.168.0.90

Everything works fine when I use /etc/ether or specify the mac:ip map as a
--dhcp-host option.

Is there anything I might be doing wrong?

Thanks,
Shashank

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