*Weird issue facing , OSPF neighborship is up between R4 and R2, though i
cant ping R2 from R4. below are the configuratons on the interfaces , can
anyone adivse why is that ?*

R2 :

interface Serial0/1/0
 description Frame Relay Links
 no ip address
 encapsulation frame-relay
 no arp frame-relay
 no frame-relay inverse-arp
 frame-relay lmi-type cisco
!
interface Serial0/1/0.24 point-to-point
 description Frame Relay Cloud 2
 bandwidth 64
 ip address 150.100.24.2 255.255.255.0
 frame-relay interface-dlci 204

R4 :

!
interface Serial0/0/0
 bandwidth 64
 ip address 150.100.24.4 255.255.255.0
 ip nat enable
 encapsulation frame-relay
 ip ospf network point-to-point
 no arp frame-relay
 frame-relay map ip 150.100.24.4 402 broadcast
 no frame-relay inverse-arp
 frame-relay lmi-type cisco
end

==========
on R4 :

R4(config)#do sospfn
Neighbor ID     Pri   State           Dead Time   Address         Interface
200.0.0.2         0   FULL/  -        00:00:39    150.100.24.2
Serial0/0/0

-------------
on R4 :

R4#ping 150.100.24.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 150.100.24.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
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