Internal 仮想NW 仮想ルータ P P P Subnet 172.24.17.0/24 Subnet 10.100.100.0/24 P P 仮想ポート FloatingIP 10.100.100.5 ssh to 10.100.100.5 FixedIP 172.24.17.5 外部NW CreateFloatingIP API AssociateFloatingIP API CreateNetwork API (external=true) CreateSubnet API CreateNetwork API (external=false) CreateSubnet API CreateVM API (specified port) CreateRouter API (specified external nw) Add interface to router API