+++ This bug was initially created as a clone of Bug #447922 +++ Someone told me IP{V6,}_ADD_MEMBERSHIP sockopts were deprecated and we should use MCAST_JOIN_GROUP instead. That fails for 32-bit userspace on 64-bit kernels, though. Fixed by upstream commit dae50295. Test case at http://david.woodhou.se/MulticastTest.c should print '5 bytes received' but will just hang.
Patch is already included in the patch that was posted for https://bugzilla.redhat.com/show_bug.cgi?id=444582 *** This bug has been marked as a duplicate of 444582 ***