R1#sh run | b Tu
interface Tunnel0
 no ip address
 no ip redirects
 ipv6 address 2002:B428:742::/64
 tunnel source Ethernet0/0
 tunnel mode ipv6ip 6to4
!
ipv6 route 2002::/16 Tunnel0


R7#sh run | b Tu
interface Tunnel0
 no ip address
 no ip redirects
 ipv6 address 2002:B428:701::/64
 tunnel source FastEthernet0/1
 tunnel mode ipv6ip 6to4
!
ipv6 route 2002::/16 Tunnel0


R7#sh int tu 0
Tunnel0 is up, line protocol is up
  Hardware is Tunnel
  MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation TUNNEL, loopback not set
  Keepalive not set
  Tunnel source 180.40.7.1 (FastEthernet0/1), destination UNKNOWN
  Tunnel protocol/transport IPv6 6to4, key disabled, sequencing disabled
  Checksumming of packets disabled
  Last input 00:02:02, output 00:02:02, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/0 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     85 packets input, 10500 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     102 packets output, 8892 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out