HELP:(cisco serial (up, up) but cannot ping its interface from within.

[Mark Jayson Alvarez]

Hi,
 
 In "sh ip int br" a particular serial interface shows to be both line and protocol up but I cannot ping the interface from within the router itself. When I tried pinging from the outside, I can ping it...
 Any idea what seems to be misconfigured in our router???
 
 Thanks..
 
		
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