From: Joseph Brunner (joe@affirmedsystems.com)
Date: Sun Jun 01 2008 - 01:16:52 ART
Oh, yeah, and after I read up on what "teredo" means, I went to the doctor
to get checked out....
GROSS sh*t man, those jocks at ietf are nasty... they think about something
harmless like tunneling ipv6 over udp packets, and the idea of teredo pops
into their heads!
YUCK
I'm quitting cisco when ios 12.5 has
int t0
tunnel mode teredo
GROSS
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Narbik Kocharians
Sent: Saturday, May 31, 2008 2:31 PM
To: Chris Gray
Cc: Cisco certification
Subject: Re: IPV6 Tunnelling
*There are 5 tunneling solution in IPv6:*
**
1. *Using the "Tunnel mode ipv6ip", in this case the tunnel source and
destination are configured with IPv4 addressing and the tunnel interface is
configured with IPv6. This will use protocol 41. This is used for IPv6/IPv4.
*
**
R1(config)#int tunnel 1
R1(config-if)#ipv6 address 12:1:12::1/64
R1(config-if)#tunnel source 10.1.12.1
R1(config-if)#tunnel destination 10.1.12.2
R1(config-if)#*tunnel mode ipv6ip*
2. *Using the "Tunnel mode gre ipv6", in this case the tunnel, tunnel source
and destination are all configured with IPv6 addressing. This is used for
IPv6/IPv6.*
BB1(config)#int tunnel 1
BB1(config-if)#ipv6 address 121:1:121::111/64
BB1(config-if)#tunnel source 10:1:111::111
BB1(config-if)#tunnel destination 10:1:112::112
BB1(config-if)#*tunnel mode gre ipv6*
**
3. *In this case, the tunnel mode is NOT used at all, note that the tunnel
interface is configured with IPv6 and the tunnel source and destination is
configured with IPv4 but no mention of tunnel mode. This configuration will
use protocol 47. This is used for IPv6/IPv4.*
R1(config)#int tunnel 13
R1(config-if)#ipv6 address 13:1:13::1/64
R1(config-if)#tunnel source 10.1.13.1
R1(config-if)#tunnel destination 10.1.13.3
4. *Note in this case a special addressing is assigned to the tunnel
interface which is a concatenation of a reserved IPv6 address of 2002
followed by the translated IPv4 address of a given interface on the router.
In this configuration ONLY the tunnel source address is used and since the
tunnel is automatic, the destination address is NOT configured. The tunnel
mode is set to "Tunnel mode ipv6ip 6to4". Note the IPv4 address of
10.1.1.1is translated to 0A.01.01.01 and once concatenated, it will be
"2002:0A01:0101: or 2002:A01:101. This is used for IPv6/IPv4.*
R1(config)#interface Tunnel14
R1(config-if)#ipv6 address 2002:A01:101::/128
R1(config-if)#tunnel source 10.1.1.1
R1(config-if)#*tunnel mode ipv6ip 6to4*
5. *ISATAP, ISATAP works like 6to4 tunnels, with one major difference,
it uses a special IPv6 address which is formed as follows:*
*In this tunnel mode, the network portion can be any IPv6 address, whereas
in 6to4 it had to start with 2002.*
*Note when the IPv6 address is assigned to the tunnel interface, the
"eui-64" is used, in this case the host portion of the IPv6 address starts
with "0000.5EFE" and then the rest of the host portion is the translated
IPv4 address of the tunnel's source IPv4 address. **This translation is
performed automatically unlike 6to4. This is used for IPv6/IPv4.
*
R4(config)#int tunnel 46
R4(config-if)#ipv6 address 46:1:46::/64 eui-64
R4(config-if)#tunnel source 10.44.44.44
R4(config-if)#*tunnel mode ipv6ip ISATAP*
Sorry for the lengthy post and i hope this helped.
On Sat, May 31, 2008 at 10:39 AM, Chris Gray <chris.gray@ozonenetworks.net>
wrote:
> 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,
> >
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
> >
> >
> >
> >
> >
>
>
> --
> Dennis Worth
>
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
-- Narbik Kocharians CCSI#30832, CCIE# 12410 (R&S, SP, Security) www.Net-Workbooks.com Sr. Technical Instructor
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