Re: Tunnel mode ipv6 or tunnel mode gre ipv6?

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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