def config(name, reset=False, **kwargs):
    '''
    Modify configuration options for a given port. Multiple options can be
    specified. To see the available options for a port, use
    :mod:`ports.showconfig <salt.modules.freebsdports.showconfig>`.

    name
        The port name, in ``category/name`` format

    reset : False
        If ``True``, runs a ``make rmconfig`` for the port, clearing its
        configuration before setting the desired options

    CLI Examples:

    .. code-block:: bash

        salt '*' ports.config security/nmap IPV6=off
    '''
    portpath = _check_portname(name)

    if reset:
        rmconfig(name)

    configuration = showconfig(name, dict_return=True)

    if not configuration:
        raise CommandExecutionError(
            'Unable to get port configuration for \'{0}\''.format(name)
        )

    # Get top-level key for later reference
    pkg = next(iter(configuration))
    conf_ptr = configuration[pkg]

    opts = dict(
        (six.text_type(x), _normalize(kwargs[x]))
        for x in kwargs
        if not x.startswith('_')
    )

    bad_opts = [x for x in opts if x not in conf_ptr]
    if bad_opts:
        raise SaltInvocationError(
            'The following opts are not valid for port {0}: {1}'
            .format(name, ', '.join(bad_opts))
        )

    bad_vals = [
        '{0}={1}'.format(x, y) for x, y in six.iteritems(opts)
        if y not in ('on', 'off')
    ]
    if bad_vals:
        raise SaltInvocationError(
            'The following key/value pairs are invalid: {0}'
            .format(', '.join(bad_vals))
        )

    conf_ptr.update(opts)
    _write_options(name, configuration)

    new_config = showconfig(name, dict_return=True)
    try:
        new_config = new_config[next(iter(new_config))]
    except (StopIteration, TypeError):
        return False

    return all(conf_ptr[x] == new_config.get(x) for x in conf_ptr)