Think of your external interface as if it were a switch. The guests are plugged in to the switch. They will have IP addresses that allow them to communicate on the network. The physical interface just ships packets back and forth between physical and virtual networks, and doesn't need its own address. Make more sense? On Wed, Nov 19, 2014, 07:53 Georgios Dimitrakakis <giorgis at acmac.uoc.gr> wrote: > Hello stackers! > > In OpenStack documentation and specifically on Legacy Networking > > http://docs.openstack.org/juno/install-guide/install/ > yum/content/ch_basic_environment.html#basics-networking-nova > > says clearly that for a two node installation the interface dedicated > to the external network should not be configured with an IP address. > > Is this correct?? > > Furthermore at the "Verify Connectivity" part is pinging successfully > on the external network and my question is how is this happening? Does > it assume that there is a third interface already connected on the > external network?? > > How is accessing the external network without even configuring the > interface dedicated at it?? Does it assume that the internal network > somehow performs a routing?? > > > Best regards, > > G. > > _______________________________________________ > Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/ > openstack > Post to : openstack at lists.openstack.org > Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/ > openstack > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack/attachments/20141119/8b13dbf4/attachment.html>