You must join the group (using IP_ADD_MEMBERSHIP) prior to using
IP_MSFILTER.
Also, there were some recent bug fixes relating to nsrcs=0 cases, so if
you really want to use that, you should use a relatively recent Linux
kernel,
if you aren't already. Adding the join before the IP_MSFILTER works on
my 2.6.17.8 system.
Also, note that a filter of {INCLUDE, {}} is equivalent to a "leave
group",
which is what it does.
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