From: Chris Gray (chris.gray@ozonenetworks.net)
Date: Sat May 31 2008 - 14:39:45 ART
I always use tunnel mode ipv6ip for these questions. Although, I don't
exactly know why! I didn't think of using GRE and am slightly surprised it
works. I was taught to use this method at a boot camp.
Another area to research some more!
Chris
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Dennis Worth
Sent: 31 May 2008 15:17
To: CCIE3000
Cc: Cisco certification
Subject: Re: IPV6 Tunnelling
I would add in dynamic with 6to4 tunnel to the mix. RFC 3056 should help
along with :
http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-tunnel_ps64
41_TSD_Products_Configuration_Guide_Chapter.html#wp1037465
HTH
On Sat, May 31, 2008 at 6:14 AM, CCIE3000 <ccie3000@googlemail.com> wrote:
> Just checking to see that I've got this straight in my head.
>
> When a question has wording along the lines of:
>
> Configure IPv6 tunnel over IPv4 network
>
> We should use tunnel mode gre ?
>
> From the follwoing debugs with tunnel mode ipv6ip I get the following:
> l13: IPv6/IP encapsulated 150.1.3.3->150.1.1.1 (linktype=79, len=92)
> *May 31 12:55:37.277: Tunnel13: IPv6/IP to classify
> 150.1.1.1->150.1.3.3(len=92 ttl=253 tos=0xE0)
> *May 31 12:55:37.277: Tunnel13: to decaps IPv6/IP packet 150.1.1.1->
> 150.1.3.3 (len=92, ttl=253)
> *May 31 12:55:37.277: Tunnel13: decapsulated IPv6/IP packet
>
> With tunnel mode gre I get the following:
> *May 31 12:58:11.573: Tunnel13: GRE/IP encapsulated
> 150.1.3.3->150.1.1.1(linktype=79, len=124)
> *May 31 12:58:11.609: Tunnel13: GRE/IP to classify
> 150.1.1.1->150.1.3.3(len=124 type=0x86DD ttl=253 tos=0x0)
>
> Also using debug ip packet detail I'm seeing protocol 47 with GRE and
> protocol 41 when ipv6ip.
>
> Firstly, am I correct to use mode gre and secondly any tips on what to
look
> for in a question to decide the tunnel mode if it's not stated?
> Thanks,
>
>
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-- Dennis Worth
This archive was generated by hypermail 2.1.4 : Mon Jun 02 2008 - 06:59:19 ART