[afripv6-discuss] Configuring a 6to4 Relay in Cisco

[hervé TYPAMM]

Jordi,
My network is not big. It's a Computer High school
network (www.esiba.edu)and we have about 50 computers.


Hervé


--- JORDI PALET MARTINEZ <jordi.palet at consulintel.es>
a écrit :

> Hi Herve,
> 
> That's easy. Let's try first to understand how big
> is your network.
> 
> What kind of customers you connect and number of
> each (residential,
> enterprises, cellular phones, etc.). Which that we
> can make an estimation of
> the size of the prefix you need and then we can
> start with the form.
> 
> Regards,
> Jordi
> 
> 
> 
> 
> > De: hervé TYPAMM <typamm at yahoo.fr>
> > Responder a: <typamm at yahoo.fr>
> > Fecha: Sat, 9 Jun 2007 15:52:04 +0200 (CEST)
> > Para: <jordi.palet at consulintel.es>, "IPv6 in
> Africa
> > <afripv6-discuss at afrinic.net>"
> <afripv6-discuss at afrinic.net>
> > Asunto: RE : [afripv6-discuss] Configuring a 6to4
> Relay in Cisco
> > 
> > Thank you Jordi for this initiative. I need help
> in
> > order to acquire my IPv6 prefix from AfriNIC
> > 
> > Hervé
> > 
> > 
> > 
> > 
> > --- JORDI PALET MARTINEZ
> <jordi.palet at consulintel.es>
> > a écrit :
> > 
> >> This info provides the steps requires in order to
> >> configure your Cisco box
> >> as a 6to4 Relay.
> >> 
> >> In order to proceed, you need to have a public
> IPv4
> >> address on that router,
> >> your own IPv6 prefix (provided by AfriNIC in this
> >> case) and IPv6 transit.
> >> 
> >> And of course, the router need to have an IOS
> >> supporting IPv6 (including
> >> 6to4 support).
> >> 
> >> If you need help in order to acquire your IPv6
> >> prefix from AfriNIC, let us
> >> know and we can help even with the request form.
> >> 
> >> Similarly, we are able to help in making sure you
> >> have the right IOS version
> >> (and to configure it) and you can get IPv6
> transit
> >> (native or tunneling)
> >> either from your upstream, or alternatively, if
> >> that's not possible, we will
> >> be able to provide free IPv6 transit to third
> party
> >> networks.
> >> 
> >> Regards,
> >> Jordi
> >> 
> >> 
> >> Details of the example configuration
> >> =====================================
> >> 
> >> The examples below is assuming that the public
> IPv4
> >> address in the WAN
> >> interface of the router is 192.1.2.3. You should
> >> replace that with the right
> >> information for your own case, same with other
> data
> >> used in the examples.
> >> 
> >> Also, you need to understand how to calculate the
> >> 6to4 IPv6 address for your
> >> router. This is done using the IPv4 address and
> the
> >> IPv6 6to4 prefix.
> >> 
> >> The 6to4 prefix 2002::/16 is taking the first 16
> >> bits. Then the bits 17 to
> >> 48 are the nibble notation for your IPv4 address.
> So
> >> in our example it will
> >> be:
> >> 
> >> 192 = c0
> >> 1 = 01
> >> 2 = 02
> >> 3 = 03
> >> 
> >> So consequently:
> >> 2002:c001:0203::/48
> >> 
> >> We will use the first address of the prefix for
> the
> >> WAN interface, so
> >> 2002:c001:0203::1/128
> >> 
> >> Also, the anycast address for 6to4 is:
> 192.88.99.1
> >> Following the same example as above, in IPv6 will
> >> be:
> >> 2002:c058:6301::/128
> >> 
> >> For our example using a Loopback, we use
> 192.3.2.3,
> >> which in IPv6 will be
> >> 2002:0c03:0203::/128
> >> 
> >> We show below two options for the 6to4 Relay. One
> >> basic configuration and
> >> another using the anycast address for 6to4. You
> just
> >> need to configure one
> >> of them (A or B).
> >> 
> >> 
> >> A) Example configuration of a basic 6to4 Relay
> >> =================================================
> >> 
> >> This relay will only be reachable for hosts or
> >> routers with a manual
> >> configuration pointing to it.
> >> 
> >> A1) Enable IPv6 in the router
> >> 
> >> ipv6 unicast-routing
> >> 
> >> A2) Ethernet0/0 interface configuration
> (obviously
> >> you can use another
> >> interface)
> >> 
> >>  interface Ethernet0/0
> >>   description 6to4 Relay Service
> >>   ip address 192.1.2.3 255.255.255.0
> >> 
> >> A3) ³tunnel 6to4² virtual interface
> >> 
> >>   interface Tunnel2002
> >>   description 6to4 Relay Interface
> >>   no ip address
> >>   no ip redirects
> >>   ipv6 address 2002:c001:0203::1/128
> >>   tunnel source Ethernet0/0
> >>   tunnel mode ipv6ip 6to4
> >> 
> >> A4) 6to4 prefix route
> >> 
> >>   ipv6 route 2002::/16 Tunnel2002
> >> 
> >> 
> >> B) Example configuration of a 6to4 Relay with
> >> anycast support
> >> 
> >
>
===============================================================
> >> 
> >> B1) Enable IPv6 in the router
> >> 
> >> ipv6 unicast-routing
> >> 
> >> B2) We use the loopback (recommended), but you
> could
> >> use an Ethernet
> >> Interface or any other one
> >> 
> >>   interface Loopback0
> >>    description 6to4 Anycast Relay Service
> >>    ip address 192.88.99.1 255.255.255.0 secondary
> >>    ip address 192.3.2.3 255.255.255.255
> >>    ipv6 address 2002:c003:0203::1/128
> >>    ipv6 mtu 1480
> >>    no ipv6 mfib fast
> >> 
> >> Note: When using IPv4 anycast addresses is
> >> recommended to configure
> >> explicitly the BGP/OSPF ID with a unicast
> address,
> >> otherwise, the router may
> >> take by default the anycast address as the ID.
> >> 
> >> B3) ³tunel 6to4² virtual interface
> >> 
> >>   interface Tunnel2002
> >>    description anycast 6to4 Relay Interface
> >>    no ip address
> 
=== message truncated ===



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