IPv6 IPv4 network interconnection, NAT-PT (v4-mapped)

[k.lingiah]

Hello , I am trying to setup nat-pt so that an ipv6-only network can communicate with an ipv4-only network and vice-versa..

I have followed the cisco ipv6 configuration guide and the following link http://cciethebeginning.wordpress.com/2009/07/27/ipv6-nat-pt-transition/

- Static NAT-PT, Dynamic NAT-PT and PAT overload were working

- however IPv4-mapped is not working and unfortunately for me it's what i have to implement on a network

I really need some help

Routers' configuration with important commands;

Router0 config;
ipv6 unicast-routing
!
interface FastEthernet0/0
no ip address
ipv6 address 2001:A:B:C::4/64
ipv6 nat prefix 2001::/96 v4-mapped WHAT_to_IPv4
ipv6 enable
ipv6 nat
!
interface FastEthernet0/1
ip address 192.168.40.199 255.255.255.0

ipv6 nat
!
ipv6 nat v4v6 source 192.168.40.104 2001::C0A8:2868
ipv6 nat v6v4 source list list_to-ipv4 interface FastEthernet0/1 overload

ipv6 access-list list_to-ipv4
permit ipv6 2001:A:B:C::/64 any

ipv6 access-list WHAT_to_IPv4
permit ipv6 any 2001::/96
!

end

Router2 config;

ipv6 unicast-routing
!
interface FastEthernet0/0
no ip address
ipv6 address 2001:A:B:C::1/64
ipv6 enable
!
ipv6 route ::/0 2001:A:B:C::4
!
end

Router1 config;
interface FastEthernet0/0

ip address 192.168.40.200 255.255.255.0
!
end

Now, when i ping ''server'' from ''router2'', even static is not working. i.e "ping  ipv6  2001::C0A8:2868" says unreachable.

ALso when testing v4mapped i.e "ping 2001::192.168.40.200", same result.

After lots of trial,testing,web research, i still have no clue what configuration is wrong.

note ; i have also attached the packet tracer simulation file.

[k.lingiah]

really need some help on this

[Konstantin Dunaev]

look this link:

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6553/white_paper_c11-676278.html

NAT-PT is more or less depricated, now it's all about NAT64 but I think  it's supported only on ASR or C7600, not on the low end devices.

to your config, I think the configuration of NAT64 prefix:

ipv6 nat prefix 2001::/96 v4-mapped WHAT_to_IPv4

should stay on global config mode, not under Interface mode

[collinks2]

Hello,

Am trying to simulate ipv6 to ipv4 network .The simulated isp will be on ipv4 network which 100.1.1.1.

the LAN-ROUTER will be on ipv6 network but the link that connects ipv6 to ipv4 will be on 100.1.1.10/29 network.

I created ipv6 nat pool as follows

ipv6 nat  v6v4 pool IPV4-ISP 100.1.1.2 100.1.1.6 prefix length 29

i also enabled ipv6 nat on the lan-router interfaces 

i try to ping 100.1.1.2 from ipv6 host but unsuccessful

can someone help ?

[jimbaile]

If you absolutely have to use NAT-PT, then you will have to disable both IPv4 and IPv6 CEF.  NAT-PT does not work in the CEF path for either transport.  I would suggest looking to NAT64 vs NAT-PT

hth,

-jim