node获取客户端ip问题

之前用的node版本是0.10.32 1.本机访问，拿到的ip是127.0.0.1； 2.别的机器方式，拿到的ip就是别的机器的ip，假如我部署在局域网内，内网访问拿到的ip格式如下：192.168.1.xxx。 后来我node版本切到4.4.3的时候，出现了问题 1.本机访问，拿到的IP是 ::1 2.别的机器访问，拿到的ip是::ffff:192.168.0.2 这什么原因呢？代码如下：

function getClientIp (req) {
    var ipAddress;
    var forwardIpStr = req.headers['x-forwarded-for'];
    if (forwardIpStr) {
        var forwardIp = forwardIpStr.split(',');
        ipAddress = forwardIp[0];
    }
    if (!ipAddress) {
        ipAddress = req.connection.remoteAdress;
    }
    if (!ipAddress) {
        ipAddress = req.socket.remoteAdress;
    }
    if (!ipAddress) {
        if (req.connection.socket) {
            ipAddress = req.connection.socket.remoteAdress;
        }
        else if (req.headers['remote_addr']) {
            ipAddress = req.headers['remote_addr'];
        }
        else if (req.headers['client_ip']) {
            ipAddress = req.headers['client_ip'];
        }
        else {
            ipAddress = req.ip;
        }

    }
    return ipAddress;
};