Re: Tunnel mode ipv6 or tunnel mode gre ipv6?

Sorry my mistake, bit strange typo. It's 47 like Mathew said.

--
Regards,
Rick Mur
CCIE2 #21946 (R&S / Service Provider)
Sr. Support Engineer  IPexpert, Inc.
URL: http://www.IPexpert.com
On 4 nov 2009, at 17:49, Divin Mathew John wrote:
> GRE is 47 aint it?
>
> On Wed, Nov 4, 2009 at 9:50 PM, Rick Mur <rmur_at_ipexpert.com> wrote:
> The first one is an abbreviation for ipv6ip, which is protocol 41
> and is IPv6 traffic encapsulated in a IPv4 packet. ipv6 gre is IPv6
> encapsulated in GRE (+IPv4) and is IP protocol 43.
>
> Totally different from each other :-)
>
>
> --
>
> Regards,
>
> Rick Mur
> CCIE2 #21946 (R&S / Service Provider)
> Sr. Support Engineer   IPexpert, Inc.
> URL: http://www.IPexpert.com
>
>
> On 4 nov 2009, at 16:45, groupstudy_at_nyms.net wrote:
>
> Sweet - thanks Nathan!
>
> 2009/11/4 Nathan Richie
<nathanr_at_boice.net.2573395321876976672.send.nyms.net
>
>
> INE has a great blog on the IPv6 tunnels. You are correct concerning
> the
> overhead, but with the GRE IPv6 tunnel, the packet can carry
> additional data
> such as IS-IS.
>
>
>
http://blog.internetworkexpert.com/2009/08/28/ipv6-transition-mechanisms-part
-2-greipv4-tunnels/
>
> Hope this helps....
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf
> Of
> groupstudy_at_nyms.net
> Sent: Tuesday, November 03, 2009 6:24 PM
> To: ccielab_at_groupstudy.com
> Subject: Tunnel mode ipv6 or tunnel mode gre ipv6?
>
> Hi chaps,
> What's the difference between running "tunnel mode ipv6" and "tunnel
> mode
> gre ipv6"? I'm working on a rented rack so I can't sniff.
>
> Both appear to work as long as each side is running the same mode,
> but not
> intercompatible. Both encapsulate in IPv6 but I don't get the need
> for two
> methods of doing this.
> I guess the easy answer is that the latter encapsulates into GRE
> before
> encapsulating into IPv6 - if that's the case, then why would anyone
> use that
> option which I assume adds extra size to the headers?
>
> Can't find much on the Cisco site or Google other than this: Static
> tunnel
> interface configured to encapsulate IPv6 or IPv4 packets in IPv6.
>
> Anyone help me out here? What am I missing?
> THANKS!
>
>
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