> But the definition of threshhold TTL says that a
>incoming multicast packets will be forwarded out of an
>interface only if it has the TTL value >= threshold
>TTL of that interface. Am I right?

No.  Zero is special, and means do not forward.  If you have
the kernel source, check out the ip_mdq() function in
/sys/netinet/ip_mroute.c; the check is:

        if ((rt->mfc_ttls[vifi] > 0) &&
            (ip->ip_ttl > rt->mfc_ttls[vifi])) {

(the threshold > 0 and the TTL > the threshold -- note, >, not >=.)

  Bill

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