RFC 4122 does allow the MAC address in a version-1 (or 2) UUID to be replaced by a random 48-bit node id, either because the node does not have a MAC address, or because it is not desirable to expose it.
RFC 4122 确实允许 "版本1"（或2）UUID 中的 MAC 地址被随机的 48 位节点 id 替换，因为该节点没有 MAC 地址，或者因为不希望暴露它。