Deal all, I followed this instruction - https://github.com/mseknibilel/OpenStack-Grizzly-Install-Guide/blob/OVS_MultiNode/OpenStack_Grizzly_Install_Guide.rst and finished Grizzly installation on ubuntu 12.04 (3 nodes), and followed this instruction - https://github.com/mseknibilel/OpenStack-Folsom-Install-guide/blob/master/OpenStack_Folsom_Install_Guide_WebVersion.rst for the network configuration using OpenVSwitch and VLAN mode. The VM can be associated with a floating IP successfully so I can ping some external IPs from the VM, e.g., www.baidu.com, but when I try to get the web page using "wget www.baidu.com", it will stuck: $ wget www.baidu.com --2013-08-15 05:41:55-- http://www.baidu.com/ Resolving www.baidu.com (www.baidu.com)... 115.239.210.27, 115.239.210.26 Connecting to www.baidu.com (www.baidu.com)|115.239.210.27|:80... connected. HTTP request sent, awaiting response... It's weird as the external ip is pingable and the http connection is established but can not get the http response... Cloud anybody help on this? Many thanks! Scott -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack/attachments/20130815/9d8cff29/attachment.html>