Neutron with type VLAN in a single interface host(Ubuntu 14.04)

0: Disabling NetworkManager  or remove it 

sudo apt-get purge network-manager

echo "manual" | sudo tee /etc/init/network-manager.override manual 

sudo stop network-manager

1: install neutron

2:config eth0(/etc/network/interfaces.d/eth0.cfg)

auto eth0

iface eth0 inet manual

  up ip link set dev $IFACE up
      up ip link set $IFACE promisc on(only for VM NIC )
      down ip link set $IFACE promisc off
  down ip link set dev $IFACE down

allow-hotplug br-ex

iface br-ex inet static

        bridge_ports eth0

        address 172.1.1.101

        netmask 255.255.0.0

        gateway 172.1.1.254

3.1  Remove default virbr0

During this process, libvirt creates a default virtual bridge (virbr0) for the guests which you can check using :

# virsh net-list --all

Since we will be creating our own bridge using OVS and won’t need the default one, we can remove it :

# virsh net-destroy default # virsh net-autostart --disable default

We can also remove ebtables as we will be using OVS instead of the default linux bridge :

# aptitude purge ebtables

3: ovs-vsctl add-port br-ex eth0

4: sudo /etc/init.d/networking restart

please make sure :

#ifconfig br-ex(ifconfig br-ex <ip> up  ifconfig br-ex netmask 255.255.255.0)

#ip link set br-ex promisc on

#route -n(route add default gw <ip>

#ifup eth0

5:/etc/sysctl.conf
 net.ipv4.ip_forward = 1
 net.ipv4.conf.all.rp_filter=0
net.ipv4.conf.default.rp_filter=0

    net.bridge.bridge-nf-call-ip6tables = 0

net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0

Boot support (Ubuntu 14.04)

The boot support for the Openvswitch is implemented very different. It depends on the Openvswitch version, the Ubuntu version and the package repository. Up to now there is NO support to bring up the interfaces automatically. In any case, a patch is required.

All Ubuntu distributions are using Openvswitch packages(by November 2013), which do not have an openvswitch upstart script. One way to bring up interfaces here is using a few lines in /etc/rc.local or patching /etc/init.d/openvswitch-switch .

The necessary lines for /etc/rc.local would be:

Code lines for /etc/rc.local

ifup br-ex

del and add route

$route del -net 10.0.0.0 netmask 255.255.255.0

$route add -net 10.0.0.0 netmask 255.255.255.0  dev eth0
$route add -net 10.0.0.0 netmask 255.255.255.0 gw 0.0.0.0

1 2 3 4 5 6 7 8

# # list the bridges # bridges=`awk '{ if ($1 == "allow-ovs") { print $2; } }' "${INTERFACES}"` # # and bring them up # [ -n "${bridges}" ] && ifup --allow=ovs ${bridges}