R2

!
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
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!
memory-size iomem 15
ip subnet-zero
!
!
no ip domain lookup
!
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key chain 10
 key 1
  key-string pwd
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!
!
!
interface FastEthernet0/0
 ip address 192.168.42.1 255.255.255.0
 duplex auto
 speed auto
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interface Serial0/0
 ip address 192.168.50.2 255.255.255.0
 ip rip send version 2
 ip rip receive version 1
 ip rip authentication mode md5
 ip rip authentication key-chain 10
 clockrate 56000
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial0/1
 ip address 192.168.52.2 255.255.255.0
 clockrate 56000
!
interface Serial0/2
 no ip address
 shutdown
!
interface Serial0/3
 ip address 192.168.56.1 255.255.255.0
 ip rip send version 1
 ip rip receive version 2
 ip rip authentication mode md5
 ip rip authentication key-chain 10
 clockrate 56000
!
router eigrp 10
 network 192.168.52.0
 no auto-summary
!
router rip
 version 2
 network 192.168.42.0
 network 192.168.50.0
 network 192.168.56.0
!
no ip http server
ip classless
!
!
!
line con 0
 exec-timeout 0 0
 logging synchronous
line aux 0
line vty 0 4
 login
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!
!
end