Thanks for the report. This actually raises an error with current Pythons:

2.7 traceback: File "xdrlib.py", line 54, in pack_uint
    self.__buf.write(struct.pack('>L', x))
struct.error: integer out of range for 'L' format code

(The 3.x error message is slightly less helpful: “struct.error: argument out of range”).

Would you like to make a patch for this?

Bug triage tips: 2.6 only gets security fixes, bugs are not fixed there anymore. “Extension modules” are modules written in C, like time; Python modules map to the “Library” component.