From: Narbik Kocharians (narbikk@gmail.com)
Date: Mon Mar 09 2009 - 04:50:21 ARST
Thameem,
I hate to do this to you, but this came right out of the WORK BOOK, actually
the work book has MORE explanation, but you need to open up the pages and
read. have you been studying or just playing around?
On Sun, Mar 8, 2009 at 9:27 PM, Thameem Maranveetil Parambath <
tparamba@thecontactcentre.ae> wrote:
>
> Narbik,
>
> This is more explained than the one you give in the workbook ;)
>
> Is there no IPv4/IPv6 tunnel ?
>
> Also soln 3: Eventhough it is not having tunnel mode command, it will use
> GRE by default right? I would say this is the GRE tunnel fo IPv6/IPv4
>
> Warm Regards,
>
>
>
>
> *Narbik Kocharians <narbikk@gmail.com>*
> Sent by: nobody@groupstudy.com
>
> 08/03/2009 08:55 PM Please respond to
> Narbik Kocharians <narbikk@gmail.com>
>
> To
> Scott Morris <smorris@internetworkexpert.com>
> cc
> GAURAV MADAN <gauravmadan1177@gmail.com>, Modular <modulartx@gmail.com>,
> Cisco certification <ccielab@groupstudy.com> Subject
> Re: IPV6 Tunnels...
>
>
>
>
> Modular,
>
>
> *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 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
> 2002followed 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 10.1.1.1 is 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*
>
> *A "Show ipv6 int tunnel xx" will reveal the IPv6 address, in this case
> 10.44.44.44 is used so 10 is translated to "0A" and 44 is translated to
> "2C", therefore, your new address should be "46:1:46::5EFE:a2c.2c2c"*
> I hope this helped.
>
> On Sun, Mar 8, 2009 at 6:22 AM, Scott Morris <
> smorris@internetworkexpert.com
> > wrote:
>
> > The pro/con I'd look at is overall packet size.
> >
> > IPv6IP you have a 40-byte IPv6 header + 20-byte IP header
> >
> > GRE you have a 40-byte IPv6 header + 8 byte GRE header + 20 byte IP
> header
> >
> > Which is smaller?
> >
> > Scott
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > GAURAV MADAN
> > Sent: Sunday, March 08, 2009 7:18 AM
> > To: Modular
> > Cc: Cisco certification
> > Subject: Re: IPV6 Tunnels...
> >
> > No pros / cons as such .. but sometimes language of ques can make us go
> mad
> >
> > protocol 47 : GRE
> > protocol 41 : IPV6IP
> >
> > I rememebr these 2 numbers always and can be useful in desiging ACLs as
> > well
> >
> >
> > Gaurav Madan.
> >
> > On Sun, Mar 8, 2009 at 4:37 AM, Modular <modulartx@gmail.com> wrote:
> >
> > > So I've learned that if you want to tunnel IPv6 over IPv4, there are
> two
> > > easy options you can turn to.
> > >
> > > 1. Normal GRE tunnel, using the default tunnel type.
> > >
> > > 2. Configuring ipv6ip tunnel type.
> > >
> > > What are the pros/cons of using each?
> > >
> > > Thanks,
> > > Mod...
> > >
> > >
> > > Blogs and organic groups at http://www.ccie.net
> > >
> > > _______________________________________________________________________
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> >
> >
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> >
> >
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> >
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> >
> >
> >
> >
> >
> >
> >
> >
>
>
> --
> Narbik Kocharians
> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> www.MicronicsTraining.com <http://www.micronicstraining.com/>
> www.Net-Workbooks.com <http://www.net-workbooks.com/>
> Sr. Technical Instructor
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>
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>
>
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-- Narbik Kocharians CCSI#30832, CCIE# 12410 (R&S, SP, Security) www.MicronicsTraining.com www.Net-Workbooks.com Sr. Technical InstructorBlogs and organic groups at http://www.ccie.net
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