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# Ns2

    """
    Export topology to ns-2
    =======================

    This example shows how to generate a topology (a line in this case) and export
    it to the ns-2 simulator
    """
    import fnss

    # create a line topology with 10 nodes
    topology = fnss.line_topology(10)

    # assign capacity of 10 Mbps to each link
    fnss.set_capacities_constant(topology, 10, 'Mbps')

    # assign delay of 2 ms to each link
    fnss.set_delays_constant(topology, 2, 'ms')

    # set buffers in each node (use packets, bytes not supported by ns-2)
    fnss.set_buffer_sizes_bw_delay_prod(topology, 'packets', 1500)

    # Add FTP application to first and last node of the line
    tcp_stack_props = {'class': 'Agent/TCP', 'class_': 2, 'fid_': 1}
    fnss.add_stack(topology, 0, 'tcp', tcp_stack_props)
    fnss.add_stack(topology, 9, 'tcp', tcp_stack_props)

    ftp_app_props = {'class': 'Application/FTP', 'type': 'FTP'}
    fnss.add_application(topology, 0, 'ftp', ftp_app_props)
    fnss.add_application(topology, 9, 'ftp', ftp_app_props)

    # export topology to a Tcl script for ns-2
    fnss.to_ns2(topology, 'ns2-script.tcl', stacks=True)

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