[Openstack] Ping from Neutron router to VM at Compute Node

James Denton james.denton at rackspace.com
Wed Oct 8 01:02:39 UTC 2014

The DHCP namespace connects to the VM network in that model, along with the instances. The router namespace connects to both the external and VM networks in that model. The router can ping the DHCP namespace along with instances, and vice versa. The router namespace provides external connectivity to instances via floating IPs (ie NATs) sourced from the external network.

The management network is used for OpenStack service traffic. You can get creative and collapse some of those networks in some cases.

James Denton
Network Engineer
Rackspace Private Cloud
james.denton at rackspace.com<mailto:james.denton at rackspace.com>

Sent from my iPhone

On Oct 7, 2014, at 7:05 PM, Danny Choi (dannchoi) <dannchoi at cisco.com<mailto:dannchoi at cisco.com>> wrote:


In a multinode setup, there are 3 networks.

  *   Management Network: Controller, Compute and Network
  *   VM traffic Network: Compute and Network
  *   External Network: Controller and Network

When pinging the VM at the Compute node from the Neutron router (via ip netns exec qrouter namespace),
which network is used?

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