From: CCIE3000 (ccie3000@googlemail.com)
Date: Mon Jun 02 2008 - 05:12:49 ART
Thanks Narbik,
That's a great and clear description.
On 5/31/08, Narbik Kocharians <narbikk@gmail.com> wrote:
>
> *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,
> > >
> > >
> > > _______________________________________________________________________
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> > >
> > >
> > >
> > >
> > >
> >
> >
> > --
> > 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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