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Not sure if there is a Net::Ping6... but you can try using AnyEvent::FastPing, it's designed to ping a large range of hosts, but I suppose it could be limited to one. It supports IPv6.

* (star)Repeats the previous item zero or more times. Greedy, so as many items as possible will be matched before trying permutations with less matches of the preceding item, up to the point where...

Is the executable bit set on the script? Does it work if you call it using the exactly same command line as in the crontab? Do you rely on any environment variables being set, on any special paths?...

Useless Use of Cat (http://partmaps.org/era/unix/award.html), this should be suffice:
grep -v \* file

cat file|grep -v \*