What causes random appearance of "blk-20-155-50" under Finder SHARED? ?

I use a MBP running Snow Leopard on a network with two Airport Extremes configured to extend the wireless network.   The network is configured for mac address filtering, and there are about a dozen wireless devices in the house, including on PC running Ubuntu Linux and connected via ethernet to one of the AirPorts.
In the past week, a new "blk-30-155-50" entry has appeared in Finder's list of SHARED objects.  This enry appears for a few minutes at random times.  "get info" says it is a "PC server" but doesn't provide any additional info.  The log has:
    /System/Library/CoreServices/NetAuthAgent.app/Contents/MacOS/NetAuthAgent[..]     isLocalNetworkAddress: The address for `blk-30-155-50' is a local address, not allowed!
This is often associated with an airport extreme going to condition yellow with loss of network connectivity.   I use VMware parallels when I need Windows 7, so there some internal VMware network, but I have not used VMware recently.
Updating the Airport Extremes did not have any effect.

Open a TextEdit window and paste again. You should see exactly the same line of text as above, beginning with "find." If that's not what you see, copy the command to the Clipboard again and paste into the TextEdit window to make sure it's the same as above. If it is, continue.
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V).
The command may take a noticeable amount of time to run. Wait for a new line ending in a dollar sign (“$”) to appear. You can then quit Terminal. Test.

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