Defining external networks on OpenStack

external_net.sh

# Load the admin credentials
. /root/openrc

# Creating the external network type VLAN with VLAND ID == 300 (Online_dev). 
# The name of the provider physical_network "ext" is mapped to a physical 
# device on the ML2 configuration file of each network node
neutron net-create \
    --provider:network_type vlan \
    --provider:physical_network ext \
    --router:external \
    --provider:segmentation_id 300 \
    online_dev

# Define the IP range for floating IPs available on that network, the gateway,
# DNS nameservers and CIDR, and no DHCP (in this case)
neutron subnet-create \
	--allocation-pool start=10.100.10.151,end=10.100.10.200 \
	--ip-version 4 \
    --gateway 10.100.10.1 \
    --disable-dhcp \
    --dns-nameserver 8.8.8.8 \
    --name online_dev-subnet \
    online_dev 10.100.10.0/24