For example, the IP xxx.xxx.xxx.1-127 works, but xxx.xxx.xxx.128-251 are not working. They are working before. Thanks.
closed as not a real question by Jim B, John Gardeniers, Ward, Scott Pack, Bart De Vos May 26 '11 at 12:24
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.
The first thing that comes to mind is an incorrect subnet mask somewhere, but you really need to give more information. What exactly are you doing?