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The Linux ping utility has the nice feature that fills the ICMPv6 echo request payload with a pattern `payload_index & 0xFF`. Then the ICMPv6 echo response payload is checked to verify that the pattern is still intact. This way corrupted messages can be detected. In the past that revealed some 6lo-fragmentation bugs in Linux when corrupted replies arrived. This feature is also useful for RIOT, so implement it in RIOTs `ping` command.