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Help !!! Why I cannot ping my own router's interfaces !!!???

Help !!! Why I cannot ping my own router's interfaces !!!???

Help !!! Why I cannot ping my own router's interfaces !!!???

(OP)
Hi all,
I have just set up a simple network to connect my head office and remote branch. This network consists of two Cisco 2500 routers, and Catalyst 1900 switches, two router are encapsulated with Frame Relay. Generally speaking, I configured my routers with very simple configuration, and my network run very well, but there is only one strange phenomenon I could not understand. That was when I connected a terminal to console port on the first router, I can ping all interfaces of every devices in the network except this router's interfaces
. Similarly, when I connect terminal to console port of the second router, I can ping to the first router's interfaces except for the second router's interfaces !!! I have asked many my colleagues but not get answers, and they told that they have experienced the same issue and didn't know why.
Please give me an explanation about this problem.
Thanks very much for any help.
John Thom

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