fd78ff23f7
reason: after the upgrade of iputils from 20151218 to 20161105 functionality of ping6 and tracepath6 was merged into ping and tracepath. Ping is now mostly a drop-in replacment for ping6, except that selecting a specific interface is done by encoding it into the address (ex.: fe80::1%eth0) rather then specifing it with the `-I` flag.
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