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I don't use (I've disabled it by normal means and blocked the ports with personal a firewall) Windows Networking (CIFS aka NetBIOS aka SMB etc), but my PC has a name as it seems to be mandatory in both Windows and Linux.

After I connect to WiFi router getting TCP/IP settings via DHCP I then can see my PC's IP and MAC addresses in the router's DHCP lease table alongside with the PC's name.

How to hide the name or show them a fake one? I am afraid the one knowing my PC's name can steal its soul...

I am in particular interested in Windows XP, Windows 7, Linux and FreeBSD solutions - write for any.

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you could just change the name to something very generic. Start-Right click Computer->Properties then hit change settings. A panel comes up that allows you changing your computer name after clicking the change button. If you just want to randomly spoof your computer name you could look for a tool like this one http://www.irongeek.com/i.php?page=security/madmacs-mac-spoofer

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+1 You generally cannot not-have a computer/host name in Windows. Soul thieves generally go after users Apple products anyway... :) – DavidChenware Aug 27 '11 at 15:07
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