Status up Protocol up but can't ping!!!

What would be the cause of seeing status up/protocol up and not able to ping itself.

I'm at a loss, the telcom says they have checked and double-check the circuit and it looks good. The router on the other end the router is up and can ping itself. Heres the config of the router in question:

Building configuration...

Current configuration : 868 bytes ! version 12.1 no service single-slot-reload-enable service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname router !

! memory-size iomem 15 ip subnet-zero ! interface Serial0 ip address encapsulation frame-relay IETF service-module t1 timeslots 1-4 frame-relay interface-dlci 16 frame-relay lmi-type ansi ! interface FastEthernet0 ip address speed auto full-duplex no cdp enable ! router rip version 2 network network neighbor ! ip classless no ip http server ! no cdp run ! line con 0 line aux 0 password xxxxx login modem InOut transport input all speed 28800 flowcontrol hardware line vty 0 4 password xxxxx login ! end

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Do 'show frame-relay map', If there isn't a map for, then you can't ping yourself. This is somewhat analogous to arp cache, where you can't ping an address that you have no arp entry for.

If you configure a map for your own address you should have better luck. Downside here is that configuring static maps may disable frame-realy inverse arp and you might be unknowingly using that the get the map for the other ends ip address.

! interface Serial0 frame-relay map ip 16 !

Alternativley, you could change to using a point-to-point subinterface, assuming this is really a point-to-point connection, e.g.

! interface Serial0 no ip address encapsulation frame-relay IETF service-module t1 timeslots 1-4 frame-relay lmi-type ansi ! interface Serial0.16 point-to-point ip address frame-relay interface-dlci 16 !

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