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Multicast Problems

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sgr

Programmer
May 24, 2000
2
GB
We have an application that runs fine on an IBM RS/6000 H50 machine, all multicast message are sent and received ok). We run the exact same binaries on a H70 machine and the multicast is unreliable (ie, we consistantly lose 1% of messages) <br><br>AIX 4.3.2 <br>The filesets are the same on both machines (except for H70 64bit libs) <br>Ethernet adapter settings are the same (exact same ethernet cards in both machines.) <br><br>&nbsp;Any ideas? <br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Simon
 
Simon,<br><br>Might be the network -- have you done any analysis looking for re-transmissions etc from the H70? <p>Mike<br><a href=mailto:Mike_Lacey@Cargill.Com>Mike_Lacey@Cargill.Com</a><br><a href= Cargill's Corporate Web Site</a><br>Please don't send me email questions without posting them in Tek-Tips as well. Better yet -- Post the question in Tek-Tips and send me a note saying "Have a look at so-and-so in the thingy forum would you?"
 
Both machines are on the same network, the servers are in the same room and the same client PC is used.<br><br>How can I check for retransmisions?&nbsp;&nbsp;'netstat -m' does not flag anything up.
 
hi....<br><br>try<br><br>netstat 1<br><br>for a rolling output of errors<br><br>some obvious things:<br><br>does your multicast app have an error log?<br><br>have you checked /var/adm/syslog/syslog.log?<br><br>are the errors load related? (do they occur at the same times each day?)<br> <p>Mike<br><a href=mailto:Mike_Lacey@Cargill.Com>Mike_Lacey@Cargill.Com</a><br><a href= Cargill's Corporate Web Site</a><br>Please don't send me email questions without posting them in Tek-Tips as well. Better yet -- Post the question in Tek-Tips and send me a note saying "Have a look at so-and-so in the thingy forum would you?"
 
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