the UUID requires 6 bytes for its spatially unique identifier node.
an IPv4 address is not enough and a MAC address will do.
If we want to provide a standard UUID, we need to use the MAC address when available (i.e.
only on Java 6) and a random 6-bytes array otherwise.
On Java 5, we can also use an IPv4 address + 2 random bytes as the node identifier.
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