I believe you are talking about 32.9 in WB1.  The tunnel mode ipv6ip
specifies ipv6 as a passenger protocol to transport over the ipv4 network.
I'm not sure how you were able to successfully ping, but since the task
requires running rip across the tunnel, you should be able to debug ip rip
and see updates coming from tunnel x.

If you setup your tunnel and don't apply the rip configuration, you should
be able to ping the ipv6 address across the tunnel.

Here is a good link describing all the tunnels for ipv6.  Marko has also
written a few blogs on the subject.  Just google ipv6 tunnel ipexpert to
find them.

http://www.cisco.com/en/US/docs/ios-xml/ios/interface/configuration/xe-3s/ip6-ipoverip6-tunls-xe.html#GUID-F963503B-27C8-49E9-A9AB-FE73298209FF



On Fri, Dec 28, 2012 at 6:59 AM, Rock's M <[email protected]> wrote:

> Hello,
>
> If the below request is not in the proper channel / mailing list , please
> guide me, This is the first post into this mailing list.
>
> In Vol 1 lab32, the Tunnel mode was used to be ipv6ip , i did the lab
> initially without having a look at solution, but later found that we should
> use ipv6ip mode for tunnel interface between r2 and r5 ? Is there any
> specific requirement as i could ping across everything without using the
> mode ?
>
> Also, there was an acl to allow the tunnel ip's on R7,8,9 , which i did
> not require.
>
> Please advice about tunnel mode and acl ?
>
>
>
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-- 
V/r,

Ryan Krcelic
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