# Revision history [back]

### Networking fundamentals

Basically there are 3 types of network managers in OpenStack, 1. Flat 2. Flat DHCP 3. VLAN

Where does VxLan and GRE come into picture in case of networking openstack.

### Networking fundamentals

Basically there are 3 types of network managers in OpenStack, 1. Flat 2. Flat DHCP 3. VLAN

Where does VxLan and GRE come into picture in case of networking openstack.

The output of external network: +---------------------------+--------------------------------------+ | Field | Value | +---------------------------+--------------------------------------+ | admin_state_up | UP | | availability_zone_hints | | | availability_zones | nova | | created_at | 2017-04-27T09:02:54Z | | description | | | id | 1ff821c7-cd71-451f-8e0e-6e87e699a6a9 | | ipv4_address_scope | None | | ipv6_address_scope | None | | is_default | False | | mtu | 1500 | | name | flat-provider-network | | port_security_enabled | True | | project_id | 07b11f80bfb24a7e9993e93b634c298c | | project_id | 07b11f80bfb24a7e9993e93b634c298c | | provider:network_type | flat | | provider:physical_network | external | | provider:segmentation_id | None | | revision_number | 6 | | router:external | External | | shared | True | | status | ACTIVE | | subnets | 3c19e210-347a-4d7a-92e3-e1e432507ac2 | | tags | [] | | updated_at | 2017-04-27T09:04:05Z | +---------------------------+--------------------------------------+

### Networking fundamentals

Basically there are 3 types of network managers in OpenStack, 1. Flat 2. Flat DHCP 3. VLAN

Where does VxLan and GRE come into picture in case of networking openstack.

The output of external network: +---------------------------+--------------------------------------+ | Field | Value | +---------------------------+--------------------------------------+ | admin_state_up | UP | | availability_zone_hints | | | availability_zones | nova | | created_at | 2017-04-27T09:02:54Z | | description | | | id | 1ff821c7-cd71-451f-8e0e-6e87e699a6a9 | | ipv4_address_scope | None | | ipv6_address_scope | None | | is_default | False | | mtu | 1500 | | name | flat-provider-network | | port_security_enabled | True | | project_id | 07b11f80bfb24a7e9993e93b634c298c | | project_id | 07b11f80bfb24a7e9993e93b634c298c | | provider:network_type | flat | | provider:physical_network | external | | provider:segmentation_id | None | | revision_number | 6 | | router:external | External | | shared | True | | status | ACTIVE | | subnets | 3c19e210-347a-4d7a-92e3-e1e432507ac2 | | tags | [] | | updated_at | 2017-04-27T09:04:05Z | +---------------------------+--------------------------------------+network:

### Networking fundamentals

Basically there are 3 types of network managers in OpenStack, 1. Flat 2. Flat DHCP 3. VLAN

Where does VxLan and GRE come into picture in case of networking openstack.

The output of external network:

### Networking fundamentals

Basically there are 3 types of network managers in OpenStack, 1. Flat 2. Flat DHCP 3. VLAN

Where does VxLan and GRE come into picture in case of networking openstack.

In my setup, i have installed openstack on 2 nodes running ubuntu 16.04. I have used linux bridge for the installation. While setting up the external network in Horizon i have selected provider network type flat. During the install i followed steps for self service network. So i assumed i should be able to create external network in horizon using vxlan. BUt VMs had access issue. The output of external network:network :