Filters given options and outputs valid settings for ETHTOOLS_PPPOE_OPTS
    If an option has a value that is not expected, this
    function will log what the Interface, Setting and what it was
    expecting.

def _parse_ethtool_pppoe_opts(opts, iface):
    '''
    Filters given options and outputs valid settings for ETHTOOLS_PPPOE_OPTS
    If an option has a value that is not expected, this
    function will log what the Interface, Setting and what it was
    expecting.
    '''
    config = {}

    for opt in _DEB_CONFIG_PPPOE_OPTS:
        if opt in opts:
            config[opt] = opts[opt]

    if 'provider' in opts and not opts['provider']:
        _raise_error_iface(iface, 'provider', _CONFIG_TRUE + _CONFIG_FALSE)

    valid = _CONFIG_TRUE + _CONFIG_FALSE
    for option in ('noipdefault', 'usepeerdns', 'defaultroute', 'hide-password', 'noauth', 'persist', 'noaccomp'):
        if option in opts:
            if opts[option] in _CONFIG_TRUE:
                config.update({option: 'True'})
            elif opts[option] in _CONFIG_FALSE:
                config.update({option: 'False'})
            else:
                _raise_error_iface(iface, option, valid)

    return config