diff -r c919a82b5a40 Lib/uuid.py
--- a/Lib/uuid.py	Mon Mar 14 10:56:33 2011 -0400
+++ b/Lib/uuid.py	Mon Mar 14 16:30:11 2011 -0400
@@ -327,8 +327,16 @@
                     words = line.lower().split()
                     for i in range(len(words)):
                         if words[i] in hw_identifiers:
-                            return int(
-                                words[get_index(i)].replace(':', ''), 16)
+                            try:
+                                return int(
+                                    words[get_index(i)].replace(':', ''), 16)
+                            # Virtual interfaces, such as those provided by
+                            # VPNs, do not have a colon-delimited MAC address
+                            # as expected, but a 16-byte HWAddr separated by
+                            # dashes. These should be ignored in favor of a
+                            # real MAC address
+                            except ValueError:
+                                continue
         except IOError:
             continue
     return None
diff -r c919a82b5a40 Misc/ACKS
--- a/Misc/ACKS	Mon Mar 14 10:56:33 2011 -0400
+++ b/Misc/ACKS	Mon Mar 14 16:30:11 2011 -0400
@@ -285,6 +285,7 @@
 Doug Fort
 John Fouhy
 Martin Franklin
+Kent Frazier
 Robin Friedrich
 Ivan Frohne
 Jim Fulton