The diagram and description of network traffic on the Network Troubleshooting page report incorrectly that an instance's tap interface is connected directly to br-int. In fact, the tapXX interface is connected via the qbrXX bridge to the qvbXX interface, which is paired with the qvoXX interface, which is connected to br-int.
When adding this information to the page, it would also be helpful to note that the security rules are applied at the tap interface. The existing section on iptables does not include this detail (although it can be discovered by listing the current iptables rules).
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URL: http://docs.openstack.org/trunk/openstack-ops/content/network_troubleshooting.html
source File: file:/home/jenkins/workspace/operations-guide-tox-doc-publishdocs/doc/openstack-ops/ch_ops_network_troubleshooting.xml
xml:id: network_troubleshooting
@Jon, I think this was originally your diagram.[ Can you take a quick look to see how it was massacred ?