Re: IPv6 automatic 6-to4 tunnel

Agreed, also if you are doing to auto 6to4, you will also need routes with
embedded ipv4 addresses as the next hops.

R4:
ipv6 route 2001:6::/64 2002:606:606::1 <---6.6.6.6 embedded in next hop

R6:
ipv6 route 2001:4::/64 2002:404:404::1 <---4.4.4.4 embedded in next hop

This is assuming you want connectivity between the Loopback6 interfaces. But
like Ryan said, I don't think auto 6to4 is a requirement. Just seems you
need P2P connectivity.

Bryan Bartik
CCIE #23707, CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com <http://www.ipexpert.com/>

On Wed, Apr 8, 2009 at 10:51 AM, Larry <cc13lab_at_gmail.com> wrote:

> your ipv6 addresses are wrong, go back and verify that they are correctly
> converted....
>
>
>
> On Wed, Apr 8, 2009 at 12:39 PM, Ryan West <rwest_at_zyedge.com> wrote:
>
> > Ruhann,
> >
> > Pretty sure you just need ipv6ip tunnels in this case. Also, where are
> the
> > RIP commands on the loopback interfaces.
> >
> > -ryan
> >
> > -----Original Message-----
> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> > Ruhann
> > Sent: Wednesday, April 08, 2009 12:26 PM
> > To: CCIE R/S, Groupstudy
> > Subject: IPv6 automatic 6-to4 tunnel
> >
> > Hi again
> >
> > I could not get this working today, in my mock.
> > The question was vague, but the only possibility I saw was automatic
> 6-to4
> > tunnel.
> > The requirement was to establish IPv6 connectivty between R4 and R6
> > loopback6 interfaces,
> > maintaining reachability when network failure, while not installing ipv6
> on
> > any of the router in between.
> >
> >
> > My config was as follow:
> > ---snip---
> > R4#sh run | s Tunnel|Loopback1|ipv6 route|unicast
> > ipv6 unicast-routing
> > interface Tunnel1
> > no ip address
> > no ip redirects
> > ipv6 address 2002:44:44::4/64
> > ipv6 rip TAG enable
> > tunnel source Loopback1
> > tunnel mode ipv6ip 6to4
> >
> > interface Loopback1
> > ip address 4.4.4.4 255.255.255.255
> > interface Loopback6
> > ipv6 add 2001:4::4/64
> >
> > ipv6 route 2002::/16 Tunnel1
> >
> >
> > R6#sh run | s Tunnel|Loopback1|ipv6 route|unicast
> > ipv6 unicast-routing
> > interface Tunnel1
> > no ip address
> > no ip redirects
> > ipv6 address 2002:66:66::6/64
> > ipv6 rip TAG enable
> > tunnel source Loopback1
> > tunnel mode ipv6ip 6to4
> >
> > interface Loopback1
> > ip address 6.6.6.6 255.255.255.255
> >
> > interface Loopback6
> > ipv6 add 2001:6::6/64
> > ipv6 route 2002::/16 Tunnel1
> > ---snip---
> >
> >
> > I had reachability between R4 and R6 Lo1 interfaces, but could not get
> > reachability through the tunnels.
> >
> > Please advise if you can spot something I did wrong,
> > Thanks
> > --
> > <ruhann>
> >
> >
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-- 
Bryan Bartik
CCIE #23707, CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com
Blogs and organic groups at http://www.ccie.net