Dear group, maybe I have found a bug in the udp stack of the darwin kernel. I found nothing via google or in the archives so I decided to post. Description: If a multicast address ist binded and connected the source address of sent packages is the multicast group address. I think there shall be the local interface address instead. Verification: I verified the behavior on my computer running: Mark-Kochs-Computer:~ mkoch$ uname -v Darwin Kernel Version 7.2.0: Thu Dec 11 16:20:23 PST 2003; root:xnu/xnu-517.3.7.obj~1/RELEASE_PPC Mark-Kochs-Computer:~ mkoch$ aka MacOSX 10.3.2 (Panther). With developer tools as recent as possible, see: ++ (GCC) 3.3 20030304 (Apple Computer, Inc. build 1495) Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. GNU Make version 3.79, by Richard Stallman and Roland McGrath. Built for powerpc-apple-darwin7.0 Copyright (C) 1988, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For the result see: Usage of sample code. I compared this to a system running Debian Gnu Linux/i386 (woody) where the expected behavior is present. You may be willing to verify this yourself, so I attached sample code in a zip-file called checkudp. Usage of sample code: In a terminal "cd" to the dir extracted from the zip file. Then build with "make". Now type something like: "./checkudp 192.168.1.2". This shall look like: Mark-Kochs-Computer:~/Desktop mkoch$ cd checkudp/ Mark-Kochs-Computer:~/Desktop/checkudp mkoch$ make g++ -g -Wall -c -o main.o main.cc g++ -g -Wall -c -o udp.o udp.cc g++ -g -Wall -c -o address.o address.cc g++ -g -Wall -c -o error.o error.cc g++ -g -Wall -c -o connection.o connection.cc g++ -o checkudp main.o udp.o address.o error.o connection.o Mark-Kochs-Computer:~/Desktop/checkudp mkoch$ ./checkudp 192.168.1.2 The src address is: 239.255.1.1 but shall be: 192.168.1.2. Mark-Kochs-Computer:~/Desktop/checkudp mkoch$ Any comments appreciated and thanks for your attention, Mark [demime 0.98b removed an attachment of type application/zip which had a name of checkudp.zip] _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.