when manipulating multicast socket attributes.
For simple, object-oriented way of doing the same thing, take a look at
IO::Socket::Multicast6 or IO::Socket::Multicast
WWW: http://search.cpan.org/dist/Socket-Multicast6/
PR: ports/110155
Submitted by: Jin-Shan Tseng <tjs at cdpa.nsysu.edu.tw>
