IPv6: nat-pt + isatap

Unanswered Question
May 4th, 2010


I'm trying to do some tests with ipv6 + nat-pt at the moment. I got most of that stuff running - except nat-pt.

Perhaps, you can give me an answer, if my basic approach is possible at all...

I'm using a 2621XM, running IOS 12.3 (c2600-advipservicesk9-mz.123-26.bin).

On my router, I configured 2 FastEthernet Interfaces + 1 Tunnel Interface:

interface Tunnel0
no ip address
no ip redirects
ipv6 address 2002:4410:4483:1::/64 eui-64
ipv6 nat
tunnel source FastEthernet0/0
tunnel mode ipv6ip isatap
interface FastEthernet0/0

ip address
duplex auto
speed auto
ipv6 address FD00:4410:4483:64::1/64
ipv6 nat
interface FastEthernet0/1
ip address
duplex auto
speed auto

As you can see above, I'm running an isatap infrastructure. Is it possible, to use nat-pt, so that external Clients, who are not part of my lan, use my 2621XM as nat-pt device? Or is it impossible to use nat-pt together with isatap?

best regards,


I have this problem too.
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Harold Ritter Fri, 05/14/2010 - 19:20


I'm not sure what you are trying to achieve here. Your end users already have native ipv4 connectivity and ipv6 connectivity through ISATAP. Why is it that you need to use NAP-PT??



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