Same basic config on all routers except R4

R1#sh run
Building configuration...

Current configuration : 1228 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
memory-size iomem 10
no aaa new-model
ip subnet-zero
!
!
no ip domain lookup
!
ip multicast-routing     <------------------------
ip cef
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Ethernet0/0
 ip address 17.57.100.1 255.255.255.0
 ip pim sparse-dense-mode     <------------------------
 half-duplex
!
interface Serial0/0
 no ip address
 encapsulation frame-relay
!
interface Serial0/0.1 point-to-point
 ip address 180.40.7.34 255.255.255.224
 ip pim sparse-dense-mode     <------------------------
 ip ospf network point-to-point
 frame-relay interface-dlci 103
!
interface Serial0/0.2 point-to-point
 ip address 180.40.7.66 255.255.255.224
 ip pim sparse-dense-mode     <------------------------
 ip ospf network point-to-multipoint
 frame-relay interface-dlci 102
!
interface Ethernet0/1
 ip address 17.100.1.1 255.255.255.0
 ip pim sparse-dense-mode     <------------------------
 half-duplex
 no keepalive
!
interface Serial0/1
 no ip address
 shutdown
!

R1#
RACK1AS>4
[Resuming connection 4 to r4 ... ]

R4#sh run
Building configuration...

Current configuration : 1045 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R4
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
!
!
ip cef
no ip domain lookup
!
ip multicast-routing     <------------------------
ip audit po max-events 100
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
 ip address 180.40.7.130 255.255.255.224
 ip nat inside
 ip pim dense-mode     <------------------------
 ip igmp join-group 224.4.4.4     <------------------------
 duplex auto
 speed auto
!
interface ATM1/0
 ip address 192.10.32.1 255.255.255.0
 ip nat outside
 no atm ilmi-keepalive
 pvc 0/72
  protocol ip 192.10.32.254 broadcast
 !
!
router ospf 1
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0
!
ip nat inside source list IPNAT interface ATM1/0 overload
no ip http server
no ip http secure-server
ip classless
!
!
!
ip access-list standard IPNAT
 permit 180.40.7.0 0.0.0.255

R4#