- [x] I have searched the
[issues](https://github.com/apache/incubator-dubbo/issues) of this repository
and believe that this is not a duplicate.
- [x] I have checked the
[FAQ](https://github.com/apache/incubator-dubbo/blob/master/FAQ.md) of this
repository and believe that this is not a duplicate.
### Environment
* Dubbo version: master branch
* Operating System version: macOS 10.13.6
* Java version: 1.8
### Step to reproduce this issue
1. start the provider demo
### Expected Result
Provider start success.
### Actual Result
Provider start failed.
If there is an exception, please attach the exception trace:
```
Caused by: java.net.SocketException: Can't assign requested address
at java.net.PlainDatagramSocketImpl.join(Native Method)
at
java.net.AbstractPlainDatagramSocketImpl.join(AbstractPlainDatagramSocketImpl.java:178)
at java.net.MulticastSocket.joinGroup(MulticastSocket.java:323)
at
org.apache.dubbo.registry.multicast.MulticastRegistry.<init>(MulticastRegistry.java:91)
... 24 more
```
If I add vm args `-Djava.net.preferIPv4Stack=true`, everything works fine.
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/2423 ]
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