HI All In this document https://cwiki.apache.org/confluence/display/CLOUDSTACK/LXC+Support+in+Cloudstack, CloudStack should support direct mode. Direct Networking
Libvirt supports direct attachment<http://libvirt.org/formatdomain.html#elementsNICSDirect>of the guest VM's network to a physical interface. To enable this mode, add the following to agent.properties: libvirt.vif.driver=com.cloud.hypervisor.kvm.resource.DirectVifDriver network.direct.source.mode=private (other values: bridge|vepa) network.direct.device=eth0 But I found the following code may cause some problem, when the nic interface type is direct If type is direct , then this nic will be ignore. Should I open a JIRA ticket ? and patch it ? String type = nic.getAttribute("type"); String mac = getAttrValue("mac", "address", nic); String dev = getAttrValue("target", "dev", nic); String model = getAttrValue("model", "type", nic); InterfaceDef def = new InterfaceDef(); NodeList bandwidth = nic.getElementsByTagName("bandwidth"); Integer networkRateKBps = 0; if ((bandwidth != null) && (bandwidth.getLength() != 0)) { Integer inbound = Integer.valueOf(getAttrValue("inbound", "average", (Element)bandwidth.item(0))); Integer outbound = Integer.valueOf(getAttrValue("outbound", "average", (Element)bandwidth.item(0))); if (inbound == outbound) networkRateKBps = inbound; } if (type.equalsIgnoreCase("network")) { String network = getAttrValue("source", "network", nic); def.defPrivateNet(network, dev, mac, nicModel.valueOf(model.toUpperCase()), networkRateKBps); } else if (type.equalsIgnoreCase("bridge")) { String bridge = getAttrValue("source", "bridge", nic); def.defBridgeNet(bridge, dev, mac, nicModel.valueOf(model.toUpperCase()), networkRateKBps); } else if (type.equalsIgnoreCase("ethernet")) { String scriptPath = getAttrValue("script", "path", nic); def.defEthernet(dev, mac, nicModel.valueOf(model.toUpperCase()), scriptPath, networkRateKBps); } interfaces.add(def); Howie