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"Xenix server" doesn't necessarily mean that the machine is running Xenix; it's just a flag in an (old) Microsoft protocol - the machine at 172.18.206.25 also claims to be an "NT server", and a "DFS server", which refers to an SMB protocol feature that was added to SMB well after Xenix was a dead operating system. It's also sending out MDNS messages, and MDNS is another protocol that came out after Xenix was dead.
172.18.206.25's MAC address is given with a prefix of "WesternD", so it's probably a machine made by Western Digital; they do make "Personal Cloud and Network Attached Storage" servers. That's probably what 172.18.206.25 is, so that traffic doesn't look suspicious.
