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router cannot ping its own interface

hi i have a 2600 cisco router and i have entered an initial config on int fa 0/1

ip address
full duplex
no shut

however i cannot ping the ip address from the router it self . what am i missing ?
2 Solutions
I recommend that you check that the interface is UP using 'show interface FastEthernet0/1'.  If it is not up, you will not be able to ping the IP address that you have assigned to the interface.
Craig BeckCommented:
If there is no active connection on the interface - so it shows as down when you issue show ip interface brief, it will not ping.

You can use the no keepalive command on the interface if you want to force the interface up without attaching a cable.
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