thank-you.
i came across the same solution. note that the TTL and LOOP multicast options are 1 byte long, so i had to do $ttl = unpack('C', $ttl).
i had similar problems using IO::Socket (V1.28) and found that the unpack done in it assumed integer values when unpacking. it also did not do packing when setting values.
in summary, i was trying to implement the IO::Socket::Multicast module as described in Network Programming with Perl by Lincoln D. Stein, 2001, found in chapter 21, page 620. but none of the examples would work. so i stepped back and tried implementing using the basic Socket module.
now that i have this step working, i hope to make more progress.
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