RE: IPv6 automatic 6-to4 tunnel

Also, I believe only static routing is supported over 6to4 tunnels.

-ryan

From: Bryan Bartik [mailto:bbartik_at_ipexpert.com]
Sent: Wednesday, April 08, 2009 1:03 PM
To: Larry
Cc: Ryan West; Ruhann; CCIE R/S, Groupstudy
Subject: 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<mailto: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<mailto: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>
[mailto: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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Received on Wed Apr 08 2009 - 13:08:48 ART