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Date: Fri, 31 May 2013 14:01:19 +0400
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Subject: Re: svn commit: r1487993 -
 /tomcat/trunk/test/org/apache/catalina/tribes/TesterMulticast.java
From: Konstantin Kolinko <knst.kolinko@gmail.com>
To: Tomcat Developers List <dev@tomcat.apache.org>
Content-Type: text/plain; charset=ISO-8859-1

2013/5/31 Mark Thomas <markt@apache.org>:
> On 31/05/2013 06:36, Rainer Jung wrote:
>> On 30.05.2013 22:15, markt@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?
>
> For the general case.
>
>> 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).
>
> OSX doesn't have any multicast routes present by default. The notes
> could certainly be amended to reflect the more general case.
>

Maybe add this to the "(7) Tests" section of BUILDING.txt?

At least a brief "see TesterMulticast.java".
This class is not part of active testsuite though.

Best regards,
Konstantin Kolinko

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