Hi James, Thanks for the explaination. How can i verify the existence of that bridge? Is br-ex that bridge as this is the only bridge that connects to external network interface? How can i view the namespace of the virtual router which is responsible for the arp replies? Thanks, Akshay
On Sat, Jan 16, 2016 at 3:16 AM, James Denton <[email protected]> wrote: > Hi Akshay, > > In most cases, you won’t have IP addresses configured on interfaces used > by Neutron. > > The Neutron L2 agents set up or configure the virtual bridges/switches on > the host based on the type of network in use (VLAN, FLAT, VXLAN, etc). In > many cases, an external provider network may be setup as a VLAN network. In > that case, the VLAN ID must correspond to the VLAN configured on the > physical switch that corresponds to your external network connected to the > external router. The Neutron virtual router will connect to a virtual > switch/bridge that effectively “bridges” the virtual network with the > physical network. When that happens, your physical router and your virtual > router will be in the same Layer 2 broadcast domain and Layer 3 network. > Thus, when you have floating IPs configured,they would come from the > ‘external’ network/pool and your physical router would send ARP requests > for those addresses. The virtual router would send ARP replies and the > traffic would be forwarded and NAT’d accordingly. > > Of course, all of this working depends on Neutron having been configured > appropriately and the networks created with the proper provider attribute > values. > > Hope that helps, > > James > > > From: Akshay Kumar Sanghai <[email protected]> > Date: Friday, January 15, 2016 at 3:13 PM > To: "[email protected]" <[email protected]> > Subject: [Openstack] [openstack][neutron]external network packets to > network node > > Hi, > I have done a kilo ubuntu installation of openstack. One thing i noticed > was the network node's external interface is unnumbered. Then how does the > external router forwards the packet to the network node? Suppose a vm has a > floating ip . I send a packet to that vm using the floating ip. The nat > happens at the network node. How does the packet reached the network node > as there is no ip assigned to the interface. I have not configured dvr and > l3 agent is running on network node. > > Thanks, > Akshay >
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