Java多播生存时间始终为0 [英] Java Multicast Time To Live is always 0

问题描述

我在设置数据报包上的TTL时遇到问题。我在将数据包发送到multicastSocket之前调用数据包上的setTTL（...）方法，但如果我使用ethereal捕获数据包，则TTL字段始终设置为0

I have a problem with setting the TTL on my Datagram packets. I am calling the setTTL(...) method on the packet before sending the packet to the multicastSocket but if I capture the packet with ethereal the TTL field is always set to 0

推荐答案

有趣的是你应该问这个，因为我只是昨天写了这篇文章，我在6个月前遇到了同样的问题。基本上你必须设置一个特殊的系统属性告诉JVM使用IPv4堆栈：

Funny that you should ask this, because I just wrote about this yesterday, I was having the same problem about 6 months ago. Basically you have to set an special system property telling the JVM to use an IPv4 stack:

-Djava.net.preferIPv4Stack=true

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