IPV6 NAT Translation

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IPV6 NAT inside router

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ALG_2811_3#show ipv6 inter br
FastEthernet0/0            [up/up]
FastEthernet0/1            [up/up]
    FE80::A60C:C3FF:FE89:3111
    2001::3
ALG_2811_3#sh run inter fa 0/1
Building configuration...


Current configuration : 130 bytes
!
interface FastEthernet0/1
 ip address 5.1.0.5 255.255.255.0
 duplex auto
 speed auto
 ipv6 address 2001::3/64
 ipv6 enable
end


ALG_2811_3#show ipv6 route
IPv6 Routing Table - 4 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
       U - Per-user Static route, M - MIPv6
       I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
       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 - EIGRP, EX - EIGRP external
C   2001::/64 [0/0]
     via ::, FastEthernet0/1
L   2001::3/128 [0/0]
     via ::, FastEthernet0/1
S   2002::/96 [1/0]
     via 2001::1
L   FF00::/8 [0/0]
     via ::, Null0
ALG_2811_3#

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IPV6 NAT router configuration

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ALG_2811_2#show ip inter br
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.74.30.182    YES NVRAM  up                    up      
FastEthernet0/1            unassigned      YES manual up                    up      
FastEthernet0/1.701        5.1.0.1         YES manual up                    up      
FastEthernet0/1.702        unassigned      YES unset  up                    up      
NVI0                       unassigned      NO  unset  up                    up      
ALG_2811_2#show ipv6 inter br
FastEthernet0/0            [up/up]
FastEthernet0/1            [up/up]
    unassigned
FastEthernet0/1.701        [up/up]
    FE80::221:55FF:FE89:5B69
FastEthernet0/1.702        [up/up]
    FE80::221:55FF:FE89:5B69
    2001::1
NVI0                       [up/up]
    FE80::221:55FF:FE89:5B68
ALG_2811_2#show run inter FastEthernet0/1.701
Building configuration...


Current configuration : 106 bytes
!
interface FastEthernet0/1.701
 encapsulation dot1Q 701
 ip address 5.1.0.1 255.255.255.0
 ipv6 nat
end


ALG_2811_2#show run inter FastEthernet0/1.702
Building configuration...


Current configuration : 110 bytes
!
interface FastEthernet0/1.702
 encapsulation dot1Q 702
 ipv6 address 2001::1/64
 ipv6 enable
 ipv6 nat
end


ALG_2811_2#show run | in ipv6 nat
 ipv6 nat
 ipv6 nat
ipv6 nat v4v6 source 5.1.0.5 2002::10
ipv6 nat v6v4 source 2001::3 5.1.0.2
ipv6 nat prefix 2002::/96
ALG_2811_2#

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IPV6 NAT inside router(IPV4 domain)

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ALG_2811_1#show ip inter br
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.74.30.181    YES NVRAM  up                    up      
FastEthernet0/1            5.1.0.5         YES manual up                    up      
ALG_2811_1#show run inter fa 0/1
Building configuration...


Current configuration : 110 bytes
!
interface FastEthernet0/1
 ip address 5.1.0.5 255.255.255.0
 load-interval 30
 duplex auto
 speed auto
end


==========================================================================

NAT translation before traffic

==========================================================================

ALG_2811_2#show ipv6 nat translations 
Prot  IPv4 source              IPv6 source
      IPv4 destination         IPv6 destination
---   ---                      ---
      5.1.0.5                  2002::10


---   5.1.0.2                  2001::3
      ---                      ---


ALG_2811_2#

==========================================================================

NAT translation after traffic

==========================================================================

ALG_2811_2#show ipv6 nat translations 
Prot  IPv4 source              IPv6 source
      IPv4 destination         IPv6 destination
---   ---                      ---
      5.1.0.5                  2002::10


---   5.1.0.2                  2001::3
      5.1.0.5                  2002::10


---   5.1.0.2                  2001::3
      ---                      ---

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

结论：

1. IPV6 NAT和纯的IPV4或者IPV6NAT有点不一样

2. ipv6 nat prefix 是关键