[GitHub] [dubbo] mengshuai85 opened issue #5888: dubbo注册到nacos，配置的对外ip（DUBBO_IP_TO_REGISTRY）被冲掉了

["mengshuai85 (GitHub)" <gi...@apache.org>]

### Environment

* Dubbo version: 2.6.7
* Operating System version: win10
* Java version: 1.8

### Steps to reproduce this issue

1、java启动业务服务，配置参数 -DDUBBO_IP_TO_REGISTRY=xx.xx.xx.xx
2、启动后注册到nacos的ip地址，是机器本身的地址
3、多网卡情况下，不能配置



### Expected Result

注册到nacos的ip地址，应该是配置的，而非机器随机ip

对应code：
private Instance createInstance(URL url) {
        String category = url.getParameter("category", "providers");
        URL newURL = url.addParameter("category", category);
        newURL = newURL.addParameter("protocol", url.getProtocol());
        String ip = NetUtils.getLocalHost();           //???????
        int port = newURL.getParameter("bind.port", url.getPort());
        Instance instance = new Instance();
        instance.setIp(ip);
        instance.setPort(port);
        instance.setMetadata(new HashMap(newURL.getParameters()));
        return instance;
    }


[ Full content available at: https://github.com/apache/dubbo/issues/5888 ]
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[GitHub] [dubbo] xli1224 commented on issue #5888: dubbo注册到nacos，配置的对外ip（DUBBO_IP_TO_REGISTRY）被冲掉了

["xli1224 (GitHub)" <gi...@apache.org>]

Please try --dubbo.protocol.host=xx.xx.xx.xx

[ Full content available at: https://github.com/apache/dubbo/issues/5888 ]
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[GitHub] [dubbo] xli1224 commented on issue #5888: dubbo注册到nacos，配置的对外ip（DUBBO_IP_TO_REGISTRY）被冲掉了

["xli1224 (GitHub)" <gi...@apache.org>]

> > Please try --dubbo.protocol.host=xx.xx.xx.xx
> 
> this way is not available，my server ip is LAN IP，and resistry ip is Internet IP，if set the host，the service can't startup，
> show ip bind error

Tried DUBBO_IP_TO_REGISTRY on my laptop, it worked. Please make sure your system property placed before your '-jar' option 
`java -DDUBBO_IP_TO_REGISTRY=192.168.50.22 -jar dubbo-greeting-service-0.0.1-SNAPSHOT.jar`

[ Full content available at: https://github.com/apache/dubbo/issues/5888 ]
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