[Openstack-operators] Neutron DHCP agent local routes

Remco remconl87 at gmail.com
Fri Apr 22 09:56:47 UTC 2016


Hi,

We are running Liberty, with provider networks. We use the Neutron DHCP
agent to configure IPv4 and IPv6 addresses for instances. This is all
working great, however we sometimes need to put multiple subnets on one
VLAN interface (for legacy reasons). This is in fact also working, however
it configures some unwanted routes.

For example, the following subnets exist in a Neutron network:

192.168.10.0/24
192.168.11.0/24
192.168.12.0/24

I.e. if the IP address obtained is 192.168.10.8/24, the following routes
are inserted:

192.168.10.0/24 with gateway 0.0.0.0
192.168.11.0/24 with gateway 0.0.0.0
192.168.12.0/24 with gateway 0.0.0.0

The first route is obviously not an issue, as this route is directly
connected, but the other routes are plain wrong and stop traffic from being
routed to the default gateway.

Does anyone know how to disable this behavior? I only want a default
gateway obtained from DHCP and I do not need any further routes.

Thanks,
Remco
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