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javaoracle-databasesocketsmulticastttl

Java Multicast Time To Live is always 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

Solution

  • Basically you have to set an special system property telling the JVM to use an IPv4 stack:

    -Djava.net.preferIPv4Stack=true