Comment 1 for bug 1807382

I also installed 2 other servers, one with Centos7 and other with Debian8,
without Openstack/Neutron. Both with the same DNSMASQ config I originally
posted.
On both I was using version DNSMASQ 2.76 (also upgraded to 2.78), using the same
ethernet interface swapping between 100.97.97.1/24 and 100.98.98.1/24, and everything works as expected. I also tested with 2 different interfaces on each case and also worked fine.
The DHCP client always was the same in all cases (Debian8, Centos7, and
Centos7 with Neutron).

It seems that the problem only happens when using DNSMAQ with Neutron
routers.