在上述两篇文章中描述的是单租户情况下同网段或不同网段间数据是如何走的，以及描述一个数据包是如何去往其他datacenter网络或互联网的。 openstack L3-GRE 网络结构分析记录 (Icehouse) 第一篇 openstack L3-GRE 网络结构分析记录 (Icehouse) 第二篇 本篇博文记录描述多租户情形下的网络及数据流情况。 首先，新建一个租户，并在该租户上下文下创建一个路由器和一个私网： 和另一个租户网络比较一下： 可以看出，两个租户共享了internet网络，这是因为在创建intern…

在上一篇文章中分析了单租户在不同网络情形下的计算节点的网络结构，但未有描述当数据包到达网络节点时候，数据包是如何走向公网的，网络的结构如下： 通过前一篇文章我们知道，对于该租户的网络来说，相当于计算节点中的虚机实例通过GRE的隧道与网络节点的虚拟路由器打通了二层，逻辑结构就像这样： 那么这个二层究竟是如何相互联系起来的。 看下网络节点的ovs： 当数据包通过GRE tunnel到达br-tun后，br-tun中的 patch-int port与 br-int中的 patch-tun port互联，数据包被送到br-…

实验网络拓扑如下：  首先创建一个L3路由器，并给租户设置三个网络 网络节点情况： root@network:/home/mycisco# ovs-vsctl show 909c85d0-ff4e-446b-bf8a-9166f0fccd24 Bridge br-int fail_mode: secure Port patch-tun Interface patch-tun type: patch options: {peer=patch-int} Port "tap78dd7f1e-53" tag: 9 Inte…

Neutron L3 Agent / What is it and how does it work? Neutron has an API extension to allow administrators and tenants to create "routers" that connect to L2 networks. Known as the "neutron-l3-agent", it uses the Linux IP stack and iptables to perform L3 forward…

OpenStack is composed of many different projects. The core projects provide compute, storage, and network resources. The Neutron project provides network resources to the OpenStack environment and can be difficult to get started with. To help get the gears tur…

In this multi-part walkthrough series, I intend to dive into the various components of the OpenStack Neutron project, and to also provide working examples of multiple networking configurations for clouds built with Rackspace Private Cloud powered by OpenStack …

In this multi-part blog series I intend to dive into the various components of the OpenStack Neutron project, and to also provide working examples of networking configurations for clouds built with Rackspace Private Cloud powered by OpenStackon Ubuntu 12.04 LT…

系列一 https://blogs.oracle.com/ronen/entry/diving_into_openstack_network_architecture https://blogs.oracle.com/ronen/entry/diving_into_openstack_network_architecture1 https://blogs.oracle.com/ronen/entry/diving_into_openstack_network_architecture2 https://blogs.…