Configure R7 so that S6 can talk with R3 Serial 1/0 interface using the IP address of 33.33.33.33, 
 do not configure any IPv4 addresses on R3.  



R7#sh run | b 0/1
!
interface FastEthernet0/1
 ip address 180.40.7.1 255.255.255.224
 duplex auto
 speed auto
 ipv6 nat
!
!
interface Serial1/0.1 point-to-point
 ipv6 address 2005:0:237::/64 eui-64
 ipv6 nat
 ipv6 ospf 1 area 0
 frame-relay interface-dlci 703
!
!
router rip
 version 2
 redistribute static
 network 180.40.0.0
 no auto-summary
!
ip route 33.33.33.0 255.255.255.0 Null0
!
!
access-list 1 permit 180.40.7.2
access-list 1 permit 180.40.7.33
!
ipv6 nat v4v6 source list 1 pool Prob10
ipv6 nat v4v6 pool Prob10 2006:66:66::1 2006:66:66::6 prefix-length 96
ipv6 nat v6v4 source 2000:3:3::3 33.33.33.33
ipv6 nat prefix 2006:66:66::/96
!
!
ipv6 prefix-list Prob10 seq 5 permit 2006:66:66::/96
!
ipv6 prefix-list test seq 5 permit 2006:4:4::/128
!
ipv6 router ospf 1
 router-id 7.7.7.7
 log-adjacency-changes
 distribute-list prefix-list Prob10 out connected
 redistribute connected
!