Tunnel mode ipv6 or tunnel mode gre ipv6?

From: <groupstudy_at_nyms.net>
Date: Tue, 3 Nov 2009 15:23:52 -0800 (PST)

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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Received on Sat Jan 01 2000 - 01:01:01 ARST

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