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javaoracle-databasesocketsmulticastttl
ajerebek
ajerebek

Reputation:

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

Upvotes: 8

Views: 4355

Answers (2)

pfranza
pfranza

Reputation: 3367

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

-Djava.net.preferIPv4Stack=true

Upvotes: 6

Mark Harrison
Mark Harrison

Reputation: 304654

To implement pfranza's fix in Oracle, where you don't have a command line:

Set the property java.net.preferIPv4Stack=true in each Oracle session as follows before calling the java code containing the multicast call with the following PL/SQL snippet:

ret := dbms_java.set_property('java.net.preferIPv4Stack','true');

If the call is successful it will return NULL.

Upvotes: 0

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