Unconnected Multicast Socket test failed when buffer size of DatagramPacket is 64512 on Linux RH7.1 with kernel version 2.4.1 . Same tests passed with buffer size 4 * 1024 or 8 * 1024 on same machine. With buffer size 64512 tests passed on other platforms like solaris and windows.

How to reproduce it:
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1. Take the tests folder from
/net/sqesvr/export/vsn/NET/merlin_jdk_net/TestSuite/tests

2. set JAVA_HOME and STABLE_JAVA_HOME to current jdk.

3. do a make with make all

4. to tests/UCSmcast and execute mcast reader and writer as below.

5. Start the Multicast writer application as
java UCSmcastWriter -d -l 0 -m 50 -b 64

6. Start the Multicast reader application as
java UCSmcastReader -d -l 500