How to Configure Network in OpenStack Queens Part 2 - Single Node
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Step 1: Cheek interface using “ip a” command
# ip a

Copy Interface file and edit
# cd /etc/sysconfig/network-scripts/
# cp ifcfg-ens33 ifcfg-br-ex
# vi ifcfg-br-ex

TYPE=OVSBridge
BOOTPROTO=static
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
NAME=br-ex
DEVICE=br-ex
DEVICETYPE=ovs
ONBOOT=yes
IPADDR=192.168.65.130
NETMASK=255.255.255.0
GATEWAY=192.168.65.2
DNS1=8.8.8.8

# vi ifcfg-ens33

TYPE="OVSPort"
DEVICETYPE="ovs"
OVS_BRIDGE="br-ex"
BOOTPROTO=static
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
NAME=ens33
DEVICE=ens33
ONBOOT=yes

- Restart Network Service
# systemctl restart network
Check Status :
# ip a

- Step 2: Configure Neutron Controller: open File and add Below line
# vi /etc/neutron/plugin.ini
type_drivers=vxlan,flat
flat_networks=*
Restart neutron-server Service
# systemctl restart neutron-server.service

- Step 3: Enables the use of External provider networks and leave blank
# vi /etc/neutron/l3_agent.ini
external_network_bridge =

Restart neutron-l3-agent
# systemctl restart neutron-l3-agent.service


- Step 4: Map the Bridge to the physical network : Find bridge_mappings and add “physnet1:br-ex“
# vi /etc/neutron/plugins/ml2/openvswitch_agent.ini
bridge_mappings = physnet1:br-ex

Restart the neutron-openvswitch-agent service
# systemctl restart neutron-openvswitch-agent

** Load source file : find in /root/
# cat keystonerc_admin
Run source file
# source keystonerc_admin

- Step 6: Create Flat External Network Interface and Associate it with the configured physical_network
neutron net-create Htu-external --provider:network_type flat --provider:physical_network physnet1 --router:external=True --shared

- Step 7: Open Dashboard: Login

- Step 8: Create Subnet for External Network

Go to → Project → Network → Networks
In network Windows find “Htu-external” and Press “Add Subnet”

Subnet Name : External
Network Address : 192.168.65.0/24
IP Version : IPv4
Gateway IP : 192.168.65.2

- Add Subnet Details: like DHCP and POOL

Allocation Pools: 192.168.65.10,192.168.65.20
DNS: 8.8.8.8

- Step 9: Now we configure Internal Network for Inside Openstack Communication
Go to → Project → Network → Networks
In Network Window Press “Create Network” button

Network Name: Htu-internal
Admin State: UP
And Check on Create Subnet

Press “ Next”
Subnet :

Add Subnet According to your Needs :

Subnet Name: Internal
Network Address: 10.0.0.0/24
IP Version: IPv4
Gateway IP: 10.0.0.1

- Step 10 : Create Router
Go to → Project → Network → Router
Press “Create Router”

Router Name: Htu-router
Admin State : UP
External Network : linuxtopic-external # select using drug-down

After Press “Create Router” Button look like
Now Add Interface :

Click Router “Htu-router” press Interface tab and again press “Add Interface” button
Subnet: Select from Drug down button

IP Address: Optional you can leave blank
Press “Submit”, Output Like
Ping your External Gateway :

* Network Topology :
Go to → Project → Network →Network Topology

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