def render_protocols(args, df):
    """ replace prootocol number with protocoal name, for common protocols"""
    df.loc[df.protocol == '1', 'protocol'] = 'icmp'
    df.loc[df.protocol == '6', 'protocol'] = 'tcp'
    df.loc[df.protocol == '17', 'protocol'] = 'udp'
    return df