On 30.05.2013 22:15, ma...@apache.org wrote:
> Author: markt
> Date: Thu May 30 20:15:15 2013
> New Revision: 1487993
> 
> URL: http://svn.apache.org/r1487993
> Log:
> Finally figured out how t get multicast working locally on my mac. Document 
> it.
> 
> Modified:
>     tomcat/trunk/test/org/apache/catalina/tribes/TesterMulticast.java
> 
> Modified: tomcat/trunk/test/org/apache/catalina/tribes/TesterMulticast.java
> URL: 
> http://svn.apache.org/viewvc/tomcat/trunk/test/org/apache/catalina/tribes/TesterMulticast.java?rev=1487993&r1=1487992&r2=1487993&view=diff
> ==============================================================================
> --- tomcat/trunk/test/org/apache/catalina/tribes/TesterMulticast.java 
> (original)
> +++ tomcat/trunk/test/org/apache/catalina/tribes/TesterMulticast.java Thu May 
> 30 20:15:15 2013
> @@ -24,6 +24,23 @@ import java.net.UnknownHostException;
>  /**
>   * A simple multicast test that replicates the core elements of Tomcat's
>   * multicast membership. If this works then multicast membership should work.
> + * Useful notes for various operating systems follow.<p>
> + * OSX
> + * <ul>
> + * <li>Multicast is not routed by default.</li>
> + * <li>Check if multicast is routed by looking at the routing table via
> + *     <code>netstat -nr</code>. If there is no line the output for 228.0.0.4
> + *     then multicast will not work.</li>
> + * <li>Add a route for multicast using
> + *     <code>sudo route -nv add -net 228.0.0.4 -interface en0</code></li>
> + * <li>The firewall blocks multicast bewteen processes on the local machine 
> so
> + *     you will need to disable the OSX forewall before the test below will
> + *     work.</li>
> + * </ul>

Shouldn't the multicast route be for network 224.0.0.0 with netmask
240.0.0.0?

I think the above is just an example multicast address and typical
system will not have a route for that one, but could and should have a
route for multicast in general (224.0.0.0/240.0.0.0).

Regards,

Rainer


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