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From Mladen Turk <>
Subject Re: tomcat-native: multicast on win32
Date Fri, 13 Feb 2009 15:34:16 GMT
Lorenz Breu wrote:
> hi once again
> i have been trying to figure out why my tomcat native based mina
> acceptor won't join a speicified multicast group. the call goes through
> Multicast.join() over the tomcat native code to apr_mcast_join which in
> turn calls do_mcast in the apr multicast.c file. then it goes to os
> specific code, and in the end i get APR_SUCCESS back. but wether when
> specifying an iface of 0 (use default) nor when giving a specific
> interface does anything actually happen. no igmp message is sent and no
> multicast group is joined. has anyone ever had similar problems, or has
> anyone used the apr multicast code successfully on win32 machines?

Try Multicast.loopback if Multicast.join fails.
Win32 is pretty weired, and not sure why the join doesn't work.
I suppose the multicast group needs to exists before joining.


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