JGroups mulitcast test program problem, cannot use bind_addr

[timlai]

Hi,
I'm new to this forum. I did attempt to search for a topic similar to mine but was not successful. Please let me know if there's a similar topic.

I'm currently attempting to test Multicasting using the JGroups test programs:
org.jgroups.tests.McastReceiverTest
org.jgroups.tests.McastSenderTest

Each of the two boxes I am using have 2 NICs each. Only one of these ethernet cards allows communication between servers (the other is port isolated). So, I must use bind_addr to specify which NIC to use.

However, I'm receiving the following error when attempting to use the programs with bind_addr:
java.net.SocketException: Can't assign requested address

This error also occurs on a simliar environment that only has 1 NIC. I also receive the same error when I specify "-use_all_interfaces" or when using the 1_4 versions of these test programs.
(Note: When not specifying a bind_addr in my 1 NIC environment, there is no error and I am able to send/receive multicast messages correctly. If not specifying a bind adress in my 2 NIC environment, no error is displayed, but no messages are received )

Can anyone tell me why this error is occuring? See below for more specifics about my environment.


OS: AIX
JRE:
java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2)
Classic VM (build 1.4.2, J2RE 1.4.2 IBM AIX build ca142-20060421 (SR5) (JIT enabled: jitc))
jgroups version: 2.4?

Note: The servers are actually virutalized LPARs, and therefore the ethernet cards associated with the bind_addr IP are also virtual.

Any help you can provide on this topic will be appreciated. Thanks!

[belaban]

Can you disable the IPv6 stack and see if it works ?

[timlai]

I checked /etc/rc.tcpip and it appears that IPv6 is not being used:
# Start up autoconf6 process
#start /usr/sbin/autoconf6 ""

Is there anything else I should check?
Thanks
-Tim

[belaban]

Hmm. This problem has occurred before on AIX with IBM's JDK. I assume there is no SUN JDK for AIX ? Can you try with JRockit ?
One route to take could also be to debug until the offending socket is created and extract the culprit code into a small standalone program.

[timlai]

As a test, I will try to find a non-IBM JDK that will work on AIX and post results here afterward. Thanks!

[timlai]

I've not been able to find a non-IBM JRE for AIX. However, I was able to eliminate this error message. As you stated above, the problem was related to IPv6. Though IPv6 did not appear to be enabled, I had to pass the below argument when running the program in order to force it to use IPv4.
-Djava.net.preferIPv4Stack=true

Thanks so much for your help in getting this error resolved!

However, unfortunately I'm still not able to receive messages from the sender program. Please let me know if you have any thoughts on why this is true(The network config appears to be fine, IGMP snooping is disabled, as is port isolation. The two machines are on the same switch).

[belaban]

Firewall ? Does the JGroups test program work ? Ethereal/Wireshark is your friend !