@Override public NicProfile allocate(Network network, NicProfile nic, VirtualMachineProfile vm) throws InsufficientVirtualNetworkCapacityException, InsufficientAddressCapacityException, ConcurrentOperationException { DataCenter dc = _dcDao.findById(network.getDataCenterId()); if (nic == null) { nic = new NicProfile(ReservationStrategy.Create, null, null, null, null); } else if (nic.getIPv4Address() == null && nic.getIPv6Address() == null) { nic.setReservationStrategy(ReservationStrategy.Start); } else { nic.setReservationStrategy(ReservationStrategy.Create); } allocateDirectIp(nic, network, vm, dc, nic.getRequestedIPv4(), nic.getRequestedIPv6()); nic.setReservationStrategy(ReservationStrategy.Create); if (nic.getMacAddress() == null) { nic.setMacAddress(_networkModel.getNextAvailableMacAddressInNetwork(network.getId())); if (nic.getMacAddress() == null) { throw new InsufficientAddressCapacityException("Unable to allocate more mac addresses", Network.class, network.getId()); } } return nic; }