From: Chris Lewis \(chrlewis\) (chrlewis@cisco.com)
Date: Wed Sep 14 2005 - 10:32:18 GMT-3
ISATAP is for dual stack hosts, ISATAP has a 64 bit IPv6 prefix and a 64
bit host portion created in EUI format. It is intended for v6 transport
over a v4 infrastrucutre, so the routers adjacent to the v6 hosts do the
encapsulation/decapsulation of v6 packets in to v4 tunnels.
Intermediate routers do not need to be configured with ISATAP
With ISATAP you have to re-enable v6 router advertisements on the tunnel
interface to allow for client auto-configuration for handling multiple
hosts.
Have you tried to configure this and had problems?
Chris
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Curt Girardin
Sent: Monday, September 12, 2005 8:33 PM
To: ccielab@groupstudy.com
Subject: IPv6 ISATAP Tunnels
Hi,
I'm having a really difficult time understanding ipv6 ISATAP tunnels;
although I understand IPv6 manual tunnels, IPv6 GRE tunnels, and Ipv6
6-to-4 auto tunnels.
I've read and re-read the cisco documentation and it seems very
high-level:
Few details on who is supposed to do encapsulation/decapsulation at each
end.
No details on how that embedded IPv4 address is used. Is this the next
hop? A tunnel endpoint? Do all routers in-between also need to be
configured for ISATAP?
If the embedded IPv4 address is a tunnel endpoint, then how do you
handle multiple hosts at each site?
Is this really designed for dual-stack end-hosts?
Am I making this more complicated than it needs to be? I've also read
the IETF draft, and that's not much help either.
If anyone has a better explanation of this type of tunnel (along with
ipv4-compatable), I would very much appreciate it.
Here is the documentation I've read thus far:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/
ipv6_c/sa_tunv6.htm
http://www.ietf.org/internet-drafts/draft-ietf-ngtrans-isatap-24.txt
Thank you,
Curt
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