!
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
!
enable secret 5 $1$OIUC$jXDRwMX/8q4GelrnczLHv0
!
no aaa new-model
ip subnet-zero
!
ip cef
ipv6 unicast-routing
!
interface Loopback0
 no ip address
 ipv6 address 2001:DB8:0:172::4/128
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!
interface Serial1/0
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/1
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/2
 description to R2 s1/2
 no ip address
 ipv6 address 2001:DB8:0:3::2/64
 serial restart-delay 0
!
interface Serial1/3
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/4
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/5
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/6
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/7
 no ip address
 shutdown
 serial restart-delay 0
!
ip classless
no ip http server
no ip http secure-server
!
gatekeeper
 shutdown
!
line con 0
 exec-timeout 0 0
 logging synchronous
 stopbits 1
line aux 0
 stopbits 1
line vty 0 4
 password network
 login
!
end