Estableceremos un tunel ISATAP entre dos sedes que solo se comunican por IPv4.
Usaremos el ejemplo:
El tunnel se establece entre direcciones IP que se generan de la siguiente manera
| 64 primeros bits | Link local address (aunque funciona cualquiera) |
| 32 siguientes bits | 000:5EFE |
| 32 ultimos bits | IPv4 en HEX |
R1
19.19.12.1 podria ser
19 = 13 Hex
12 = 0C Hex
01 = 01 HEX
2002:1:2:3:0:5EFE:1313:0C1C/64
19 = 13 Hex
45 = 2D Hex
05 = 05 HEX
2002:1:2:3:0:5EFE:1313:0C1C/64
R1#sh run int tun 0
Building configuration...
Current configuration : 151 bytes
!
interface Tunnel0
no ip address
ipv6 address 2002:1:2:3:0:5EFE:1313:0C01/64
tunnel source 19.19.12.1
tunnel mode ipv6ip isatap
end
R5#sh run int tun 0
Building configuration...
Current configuration : 151 bytes
!
interface Tunnel0
no ip address
ipv6 address 2002:1:2:3:0:5EFE:1313:2D05/64
tunnel source 19.19.45.5
tunnel mode ipv6ip isatap
end
Verificamos
R5#sh int tun 0
Tunnel0 is up, line protocol is up
Hardware is Tunnel
MTU 1514 bytes, BW 9 Kbit/sec, DLY 500000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation TUNNEL, loopback not set
Keepalive not set
Tunnel source 19.19.45.5, destination UNKNOWN
Tunnel protocol/transport IPv6 ISATAP
R5#
*Mar 1 02:20:07.515: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up
R5#ping 2002:1:2:3:0:5EFE:1313:C01
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2002:1:2:3:0:5EFE:1313:C01, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 72/92/104 ms
R1#ping fec0:15::5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to FEC0:15::5, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 80/84/92 ms
Aunque sea una interfaz point-to-point desconoce el vecino así que deberíamos utilizar enrutamiento estático
R1(config)#ipv6 route ::/0 2002:1:2:3:0:5EFE:1313:2D05
R5(config)#ipv6 route ::/0 2002:1:2:3:0:5EFE:1313:0C01
R5#ping 2013::1 source lo0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2013::1, timeout is 2 seconds:
Packet sent with a source address of 2013::5
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 80/92/104 ms