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New Member

Connecting ipv6 to ipv4 network (NAT-PT) - old post

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 ''Enabling Traffic to be Sent from an IPv6 Network to an IPv4 Network without Using IPv6 Destination Address Mapping"

http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-nat_trnsln_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1056993

However i cannot make it to work, i really need some help

Below is the topology and the router config;

note; simulated using  latest packet tracer and static mapping was working

hostname RouterIPv6 NAT-PT.png

!

ipv6 unicast-routing

!

interface FastEthernet0/0

no ip address

duplex auto

speed auto

ipv6 address 2001:DB8:FFFF:1::9/64

ipv6 nat prefix 2000::/96 v4-mapped v4mapcal

ipv6 enable

ipv6 nat

!

interface FastEthernet0/1

ip address 192.168.1.1 255.255.255.0

duplex auto

speed auto

ipv6 nat

!

interface Vlan1

no ip address

shutdown

!

ip classless

!

ipv6 access-list v4mapcal

permit ipv6 2001::/96 2000::/96

!

line con 0

line vty 0 4

login

!

end

2 REPLIES
New Member

Re: Connecting ipv6 to ipv4 network (NAT-PT)

I imagine it's not working since either your IPv6 address on fa0/0 or the ipv6 access list 'v4mapcal' is wrong.

2001:DB8:FFFF:1::9/64

does not match

2001::/96

This works the same as IPv4 masking, so maybe writing them out illustrates your problem (slashes represent where the mask ends):

2001:0db8:ffff:0001 / 0000:0000:0000:0009

2001:0000:0000:0000:0000:0000 / 0000:0000

Either re-IPv6 your fa0/0 interface to something like:  2001::9/64

Or redo your access list to something like:  permit ipv6 2001:db8:ffff:1::/96

cheers.

New Member

Re: Connecting ipv6 to ipv4 network (NAT-PT)

really thanks for replying, however after not only ackowledging your reply but also after some extensive research, i have decided to simulate a network with simpler configurations.

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