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openstack cloudstack router networking iaas ha bottleneck lb dvr eywa gateway spof distributed multiple network cloud loadbanancing high-availability architecture vxlan cloud computing routevm sdn devstack virtualization opensource multitenant loadbanancing loadbanancing loadbanancing kvm loadbanancing loadbanancing qemu manual guide vm document isolation vlan multicast capsulation ceph cluster durability management osd pg replica storage iot ip nat nat-traversal p2p private tcp traversal udp direct networking tenant opendaylight mininet test suite demo tunnel routeflow datacenter limitation diagram openneubla workflow opennebula paper big data