Re: Tunnel mode ipv6 or tunnel mode gre ipv6?

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!
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
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