What this page shows is a simple ping output to a specific host.

The default byte size is 56. You can probably block this probe by using iptables like this:

Not all sources ( random for now ) have ipv6

iptables -I INPUT -p icmp -j DROP

Ofcourse, you can be more specific and only block ICMP-Echo and ICMP-Reply and specify an interface/source/destination on both destination/source.