네트워크 및 서버/네트워크

IPv6(2)

잉여토끼 2024. 12. 5. 15:12

6 To 4 Tunneling

Tunneling

패킷을 Incapsulation 하여 전달하는 것을 Tunneling이라한다.  캡슐화를 풀지 않는 이상 어떤 패킷이 전달되는지 다른 노드에서 알 수 없다.

6 To 4 Tunneling

IPv6는 IPv4의 IP 고갈에 의해서 등장했다. 따라서 IPv4로 이미 구축된 망이 있으며 IPv4와 통신이 불가능하지만 새로운 망인 IPv6의 망을 구축할 수 있다.

다만 IPv6끼리 통신이 가능하나 IPv6 - IPv4 -IPv6와 같이 서로 이어지지 않은 망 구조일때 IPv6와 IPv4를 혼용하는 경계라우터에서 다른 경계라우터로 Incapsulation하여 전달하는 방식을 사용 할 수 있다. 이를 6 to 4 Tunneling이라한다. cisco에서는 GRE라 한다.

 

현제까지 공부한 가상 인터페이스 종류

1. Loopback Interface

2. SVI : vlan 인터페이스 --> L2 인터페이스로 L3

3. VL0 --> OSPF : ABR 및 ABR끼리의 가상 경로 생성. Tunneling

4. Tunnel Interface : 가상 터널로 여러동작 모드가 있음.

명령어

** 터널링시 해당 라우터끼리는 Next Hop(Neighbor Node)로 인식

6 To 4 Tunneling

conf t
interface tunnel [Interface]
ipv6 enable
#주소값을 사용하지 않음을 선언. 
#그러나 주소가 없을 경우 동작을 안하므로 다른 인터페이스의 주소를 끌어다 사용.
ipv6 unnumbered [Another Interface]
tunnel source [Tunneling Source Interface IP]
tunnel destination [Tunneling Destination Interface IP]
tunnel mode ipv6

 

 

실습

네트워크 랩

- R3와 R6에서 6 To 4 Tunneling

 

R1 R1 show run 
Building configuration...

Current configuration : 1650 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
no aaa new-model
ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
ipv6 unicast-routing
ipv6 cef
!
multilink bundle-name authenticated
!
!
voice dsp waitstate 0
!
!
!
!
!
!
!
!
!
!
!
!
!
memory-size iomem 0
archive
 log config
  hidekeys
! 
!
!
!
!
ip tcp synwait-time 5
!
!
!
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!
interface Serial1/0
 no ip address
 ipv6 address 2000::1:1:1:1/64
 ipv6 enable
 ipv6 eigrp 100
 serial restart-delay 0
!
interface Serial1/1
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/2
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/3
 no ip address
 shutdown
 serial restart-delay 0
!
interface Ethernet2/0
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/1
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/2
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/3
 no ip address
 shutdown
 duplex half
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
no cdp log mismatch duplex
ipv6 router eigrp 100
 eigrp router-id 1.0.0.0
 no shutdown
!
!
!
!
!
!
!
!
control-plane
!
!
!
mgcp fax t38 ecm
!
!
!
!
gatekeeper
 shutdown
!
!
line con 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line aux 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line vty 0 4
 login
!
end
R1 show ipv6 protocol 
IPv6 Routing Protocol is "connected"
IPv6 Routing Protocol is "eigrp 100"
  EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
  EIGRP maximum hopcount 100
  EIGRP maximum metric variance 1
  Interfaces:
    Serial1/0
  Redistribution:
    None
  Maximum path: 16
  Distance: internal 90 external 170
R1 show ipv6 eigrp neighbor 
IPv6-EIGRP neighbors for process 100
H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq
                                            (sec)         (ms)       Cnt Num
0   Link-local address:     Se1/0              8 04:38:57   23   200  0  11
    FE80::C802:78FF:FEA4:0
R1 show ipv6 eigrp topology 
IPv6-EIGRP Topology Table for AS(100)/ID(1.0.0.0)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status 

P 2000::/64, 1 successors, FD is 2169856
        via Connected, Serial1/0
P 2002::/64, 1 successors, FD is 2809856
        via FE80::C802:78FF:FEA4:0 (2809856/2297856), Serial1/0
P 2004::/64, 1 successors, FD is 2681856
        via FE80::C802:78FF:FEA4:0 (2681856/2169856), Serial1/0
R1 show ipv6 route 
IPv6 Routing Table - Default - 5 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
       B - BGP, M - MIPv6, R - RIP, I1 - ISIS L1
       I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary, D - EIGRP
       EX - EIGRP external
       O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
C   2000::/64 [0/0]
     via Serial1/0, directly connected
L   2000::1:1:1:1/128 [0/0]
     via Serial1/0, receive
D   2002::/64 [90/2809856]
     via FE80::C802:78FF:FEA4:0, Serial1/0
D   2004::/64 [90/2681856]
     via FE80::C802:78FF:FEA4:0, Serial1/0
L   FF00::/8 [0/0]
     via Null0, receive
R2 R2 show run 
Building configuration...

Current configuration : 1700 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
no aaa new-model
ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
ipv6 unicast-routing
ipv6 cef
!
multilink bundle-name authenticated
!
!
voice dsp waitstate 0
!
!
!
!
!
!
!
!
!
!
!
!
!
memory-size iomem 0
archive
 log config
  hidekeys
! 
!
!
!
!
ip tcp synwait-time 5
!
!
!
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!
interface Serial1/0
 no ip address
 ipv6 address 2000::1:1:1:2/64
 ipv6 enable
 ipv6 eigrp 100
 serial restart-delay 0
!
interface Serial1/1
 no ip address
 ipv6 address 2004::1:2:1:1/64
 ipv6 enable
 ipv6 eigrp 100
 serial restart-delay 0
!
interface Serial1/2
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/3
 no ip address
 shutdown
 serial restart-delay 0
!
interface Ethernet2/0
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/1
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/2
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/3
 no ip address
 shutdown
 duplex half
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
no cdp log mismatch duplex
ipv6 router eigrp 100
 eigrp router-id 2.0.0.0
 no shutdown
!
!
!
!
!
!
!
!
control-plane
!
!
!
mgcp fax t38 ecm
!
!
!
!
gatekeeper
 shutdown
!
!
line con 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line aux 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line vty 0 4
 login
!
end
R2 show ipv6 protocol 
IPv6 Routing Protocol is "connected"
IPv6 Routing Protocol is "eigrp 100"
  EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
  EIGRP maximum hopcount 100
  EIGRP maximum metric variance 1
  Interfaces:
    Serial1/0
    Serial1/1
  Redistribution:
    None
  Maximum path: 16
  Distance: internal 90 external 170
R2 show ipv6 eigrp neighbor 
IPv6-EIGRP neighbors for process 100
H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq
                                            (sec)         (ms)       Cnt Num
1   Link-local address:     Se1/1              5 04:25:06   24   300  0  3
    FE80::C803:52FF:FE60:0
0   Link-local address:     Se1/0              8 04:39:02   28   200  0  5
    FE80::C801:8CFF:FE90:0
R2 show ipv6 eigrp topology 
IPv6-EIGRP Topology Table for AS(100)/ID(2.0.0.0)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status 

P 2000::/64, 1 successors, FD is 2169856
        via Connected, Serial1/0
P 2002::/64, 1 successors, FD is 2297856
        via FE80::C803:52FF:FE60:0 (2297856/128256), Serial1/1
P 2004::/64, 1 successors, FD is 2169856
        via Connected, Serial1/1
R2 show ipv6 route 
IPv6 Routing Table - Default - 6 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
       B - BGP, M - MIPv6, R - RIP, I1 - ISIS L1
       I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary, D - EIGRP
       EX - EIGRP external
       O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
C   2000::/64 [0/0]
     via Serial1/0, directly connected
L   2000::1:1:1:2/128 [0/0]
     via Serial1/0, receive
D   2002::/64 [90/2297856]
     via FE80::C803:52FF:FE60:0, Serial1/1
C   2004::/64 [0/0]
     via Serial1/1, directly connected
L   2004::1:2:1:1/128 [0/0]
     via Serial1/1, receive
L   FF00::/8 [0/0]
     via Null0, receive
R3 R3 show run 
Building configuration...

Current configuration : 2017 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R3
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
no aaa new-model
ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
ipv6 unicast-routing
ipv6 cef
!
multilink bundle-name authenticated
!
!
voice dsp waitstate 0
!
!
!
!
!
!
!
!
!
!
!
!
!
memory-size iomem 0
archive
 log config
  hidekeys
! 
!
!
!
!
ip tcp synwait-time 5
!
!
!
!
interface Loopback0
 no ip address
 ipv6 address 2002::1:1:1:1/64
 ipv6 enable
 ipv6 eigrp 100
!
interface Tunnel36
 no ip address
 ipv6 unnumbered Loopback0
 ipv6 enable
 ipv6 eigrp 100
 tunnel source 1.1.1.1
 tunnel destination 1.1.2.2
 tunnel mode ipv6
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!
interface Serial1/0
 ip address 1.1.1.1 255.255.255.0
 serial restart-delay 0
!
interface Serial1/1
 no ip address
 ipv6 address 2004::1:2:1:2/64
 ipv6 enable
 ipv6 eigrp 100
 serial restart-delay 0
!
interface Serial1/2
 ip address 1.2.1.1 255.255.255.0
 serial restart-delay 0
!
interface Serial1/3
 no ip address
 shutdown
 serial restart-delay 0
!
interface Ethernet2/0
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/1
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/2
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/3
 no ip address
 shutdown
 duplex half
!
router rip
 version 2
 network 1.0.0.0
 no auto-summary
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
no cdp log mismatch duplex
ipv6 router eigrp 100
 eigrp router-id 3.0.0.0
 no shutdown
!
ipv6 router eigrp 10
 shutdown
!
!
!
!
!
!
!
!
control-plane
!
!
!
mgcp fax t38 ecm
!
!
!
!
gatekeeper
 shutdown
!
!
line con 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line aux 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line vty 0 4
 login
!
end
R3 show ipv6 protocol 
IPv6 Routing Protocol is "connected"
IPv6 Routing Protocol is "eigrp 100"
  EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
  EIGRP maximum hopcount 100
  EIGRP maximum metric variance 1
  Interfaces:
    Serial1/1
    Loopback0
    Tunnel36
  Redistribution:
    None
  Maximum path: 16
  Distance: internal 90 external 170

IPv6 Routing Protocol is "eigrp 10"
  EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
  EIGRP maximum hopcount 100
  EIGRP maximum metric variance 1
  Interfaces:
  Redistribution:
    None
  Maximum path: 16
  Distance: internal 90 external 170
R3 show ipv6 eigrp neighbor 
IPv6-EIGRP neighbors for process 100
H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq
                                            (sec)         (ms)       Cnt Num
0   Link-local address:     Se1/1             14 04:25:11   37   222  0  10
    FE80::C802:78FF:FEA4:0
IPv6-EIGRP neighbors for process 10
% EIGRP 10 is in SHUTDOWN
R3 show ipv6 eigrp topology 
IPv6-EIGRP Topology Table for AS(100)/ID(3.0.0.0)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status 

P 2000::/64, 1 successors, FD is 2681856
        via FE80::C802:78FF:FEA4:0 (2681856/2169856), Serial1/1
P 2002::/64, 1 successors, FD is 128256
        via Connected, Loopback0
P 2004::/64, 1 successors, FD is 2169856
        via Connected, Serial1/1
IPv6-EIGRP Topology Table for AS(10)/ID(1.2.1.1)
% EIGRP 10 is in SHUTDOWN
R3 show ipv6 route 
IPv6 Routing Table - Default - 6 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
       B - BGP, M - MIPv6, R - RIP, I1 - ISIS L1
       I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary, D - EIGRP
       EX - EIGRP external
       O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
D   2000::/64 [90/2681856]
     via FE80::C802:78FF:FEA4:0, Serial1/1
C   2002::/64 [0/0]
     via Loopback0, directly connected
L   2002::1:1:1:1/128 [0/0]
     via Loopback0, receive
C   2004::/64 [0/0]
     via Serial1/1, directly connected
L   2004::1:2:1:2/128 [0/0]
     via Serial1/1, receive
L   FF00::/8 [0/0]
     via Null0, receive
R4 R4 show run 
Building configuration...

Current configuration : 1596 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R4
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
no aaa new-model
ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
no ipv6 cef
!
multilink bundle-name authenticated
!
!
voice dsp waitstate 0
!
!
!
!
!
!
!
!
!
!
!
!
!
memory-size iomem 0
archive
 log config
  hidekeys
! 
!
!
!
!
ip tcp synwait-time 5
!
!
!
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!
interface Serial1/0
 ip address 1.1.1.2 255.255.255.0
 serial restart-delay 0
!
interface Serial1/1
 ip address 1.1.2.1 255.255.255.0
 serial restart-delay 0
!
interface Serial1/2
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/3
 no ip address
 shutdown
 serial restart-delay 0
!
interface Ethernet2/0
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/1
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/2
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/3
 no ip address
 shutdown
 duplex half
!
router rip
 version 2
 network 1.0.0.0
 no auto-summary
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
no cdp log mismatch duplex
!
!
!
!
!
!
!
control-plane
!
!
!
mgcp fax t38 ecm
!
!
!
!
gatekeeper
 shutdown
!
!
line con 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line aux 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line vty 0 4
 login
!
end
R4 show ipv6 route 
% Specified IPv6 routing table does not exist
R5 R5 show run 
Building configuration...

Current configuration : 1596 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R5
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
no aaa new-model
ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
no ipv6 cef
!
multilink bundle-name authenticated
!
!
voice dsp waitstate 0
!
!
!
!
!
!
!
!
!
!
!
!
!
memory-size iomem 0
archive
 log config
  hidekeys
! 
!
!
!
!
ip tcp synwait-time 5
!
!
!
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!
interface Serial1/0
 ip address 1.2.2.1 255.255.255.0
 serial restart-delay 0
!
interface Serial1/1
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial1/2
 ip address 1.2.1.2 255.255.255.0
 serial restart-delay 0
!
interface Serial1/3
 no ip address
 shutdown
 serial restart-delay 0
!
interface Ethernet2/0
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/1
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/2
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/3
 no ip address
 shutdown
 duplex half
!
router rip
 version 2
 network 1.0.0.0
 no auto-summary
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
no cdp log mismatch duplex
!
!
!
!
!
!
!
control-plane
!
!
!
mgcp fax t38 ecm
!
!
!
!
gatekeeper
 shutdown
!
!
line con 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line aux 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line vty 0 4
 login
!
end
R5 show ipv6 route 
% Specified IPv6 routing table does not exist
R6 R6 show run 
Building configuration...

Current configuration : 2020 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R6
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
no aaa new-model
ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
ipv6 unicast-routing
ipv6 cef
!
multilink bundle-name authenticated
!
!
voice dsp waitstate 0
!
!
!
!
!
!
!
!
!
!
!
!
!
memory-size iomem 0
archive
 log config
  hidekeys
! 
!
!
!
!
ip tcp synwait-time 5
!
!
!
!
interface Loopback0
 no ip address
 ipv6 address 2002::1:1:1:2/64
 ipv6 enable
 ipv6 eigrp 100
!
interface Tunnel36
 no ip address
 ipv6 unnumbered Loopback0
 ipv6 enable
 ipv6 eigrp 100
 tunnel source 1.1.2.2
 tunnel destination 1.1.1.1
 tunnel mode ipv6
!
interface Tunnel64
 no ip address
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!
interface Serial1/0
 ip address 1.2.2.2 255.255.255.0
 serial restart-delay 0
!
interface Serial1/1
 ip address 1.1.2.2 255.255.255.0
 serial restart-delay 0
!
interface Serial1/2
 no ip address
 ipv6 address 2001::1:1:1:1/64
 ipv6 enable
 ipv6 eigrp 100
 serial restart-delay 0
!
interface Serial1/3
 no ip address
 shutdown
 serial restart-delay 0
!
interface Ethernet2/0
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/1
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/2
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/3
 no ip address
 shutdown
 duplex half
!
router rip
 version 2
 network 1.0.0.0
 no auto-summary
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
no cdp log mismatch duplex
ipv6 router eigrp 100
 eigrp router-id 6.0.0.0
 no shutdown
!
!
!
!
!
!
!
!
control-plane
!
!
!
mgcp fax t38 ecm
!
!
!
!
gatekeeper
 shutdown
!
!
line con 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line aux 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line vty 0 4
 login
!
end
R6 show ipv6 protocol 
IPv6 Routing Protocol is "connected"
IPv6 Routing Protocol is "eigrp 100"
  EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
  EIGRP maximum hopcount 100
  EIGRP maximum metric variance 1
  Interfaces:
    Serial1/2
    Loopback0
    Tunnel36
  Redistribution:
    None
  Maximum path: 16
  Distance: internal 90 external 170
R6 show ipv6 eigrp neighbor 
IPv6-EIGRP neighbors for process 100
H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq
                                            (sec)         (ms)       Cnt Num
0   Link-local address:     Se1/2             10 03:32:50   36   216  0  5
    FE80::C807:3AFF:FED8:0
R6 show ipv6 eigrp topology 
IPv6-EIGRP Topology Table for AS(100)/ID(6.0.0.0)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status 

P 2001::/64, 1 successors, FD is 2169856
        via Connected, Serial1/2
P 2002::/64, 1 successors, FD is 128256
        via Connected, Loopback0
R6 show ipv6 route 
IPv6 Routing Table - Default - 5 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
       B - BGP, M - MIPv6, R - RIP, I1 - ISIS L1
       I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary, D - EIGRP
       EX - EIGRP external
       O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
C   2001::/64 [0/0]
     via Serial1/2, directly connected
L   2001::1:1:1:1/128 [0/0]
     via Serial1/2, receive
C   2002::/64 [0/0]
     via Loopback0, directly connected
L   2002::1:1:1:2/128 [0/0]
     via Loopback0, receive
L   FF00::/8 [0/0]
     via Null0, receive
R7 R7 show run 
Building configuration...

Current configuration : 1650 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R7
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
no aaa new-model
ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
ipv6 unicast-routing
ipv6 cef
!
multilink bundle-name authenticated
!
!
voice dsp waitstate 0
!
!
!
!
!
!
!
!
!
!
!
!
!
memory-size iomem 0
archive
 log config
  hidekeys
! 
!
!
!
!
ip tcp synwait-time 5
!
!
!
!
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
 no ip address
 ipv6 address 2001::1:1:1:2/64
 ipv6 enable
 ipv6 eigrp 100
 serial restart-delay 0
!
interface Serial1/3
 no ip address
 shutdown
 serial restart-delay 0
!
interface Ethernet2/0
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/1
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/2
 no ip address
 shutdown
 duplex half
!
interface Ethernet2/3
 no ip address
 shutdown
 duplex half
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
no cdp log mismatch duplex
ipv6 router eigrp 100
 eigrp router-id 7.0.0.0
 no shutdown
!
!
!
!
!
!
!
!
control-plane
!
!
!
mgcp fax t38 ecm
!
!
!
!
gatekeeper
 shutdown
!
!
line con 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line aux 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line vty 0 4
 login
!
end
R7 show ipv6 protocol 
IPv6 Routing Protocol is "connected"
IPv6 Routing Protocol is "eigrp 100"
  EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
  EIGRP maximum hopcount 100
  EIGRP maximum metric variance 1
  Interfaces:
    Serial1/2
  Redistribution:
    None
  Maximum path: 16
  Distance: internal 90 external 170
R7 show ipv6 eigrp neighbor 
IPv6-EIGRP neighbors for process 100
H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq
                                            (sec)         (ms)       Cnt Num
0   Link-local address:     Se1/2              8 03:32:54   28   200  0  5
    FE80::C806:7FFF:FE34:0
R7 show ipv6 eigrp topology 
IPv6-EIGRP Topology Table for AS(100)/ID(7.0.0.0)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status 

P 2001::/64, 1 successors, FD is 2169856
        via Connected, Serial1/2
P 2002::/64, 1 successors, FD is 2297856
        via FE80::C806:7FFF:FE34:0 (2297856/128256), Serial1/2
R7 show ipv6 route 
IPv6 Routing Table - Default - 4 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
       B - BGP, M - MIPv6, R - RIP, I1 - ISIS L1
       I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary, D - EIGRP
       EX - EIGRP external
       O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
C   2001::/64 [0/0]
     via Serial1/2, directly connected
L   2001::1:1:1:2/128 [0/0]
     via Serial1/2, receive
D   2002::/64 [90/2297856]
     via FE80::C806:7FFF:FE34:0, Serial1/2
L   FF00::/8 [0/0]
     via Null0, receive