From: ashwin kohli (ashwin_kohli1@yahoo.com)
Date: Wed Aug 10 2005 - 11:01:18 GMT-3
Rohan,
1. I presume you are using a 6to4relay IPv6 tunneling. Here are some basic 6to4 tunneling parameters:
- Tunnel source address unnumbered to the external physical interface
- Tunnel destination address not required as built on a point-to-multipoint as needed basis
- 6to4 Relay Router Physical interface Has to be part of 2002::/16 subnet. This is in the following format : 2002:IPv4address:SLA::x/64. Where x is a predefined number. Please remember to convert you ipv4 address to hex for this address format. Define you IPv4 subnet between R2 and R3 on the same subnet (your subnet looks different), convert it to hex and place it in the IPv6 6to4 address format.
- Other 6to4 Routers physical interface Has to be part of 2002::/16 subnet. This is in the following format : 2002:IPv4address:SLA::/64 eui-64. Please remember to convert you ipv4 address to hex for this address format. See previous bullet.
- Make sure you complete these calculations before starting any configuration
2. Define R2 or R3 is a relay router. Lets say you pick R2 as your relay router, then define static routes on that router to all subnets it does not know about:
R2
----
ipv6 route 2002:c900:0001:1::/64 {next-hop being R3's IPv6 address you calculated above}
ipv6 route 2002::/16 tunnel 0 {This ALWAYS has to be configured for this type of tunnel}
R3
----
ipv6 route ::/0 {next hop being R2's IP6 address you calculated above}
ipv6 route 2002::/16 tunnel 0 {This ALWAYS has to be configured for this type of tunnel}
Remember the configurations for the different types of IPv6 tunnels differ from manual, gre, 6to4, ISATAP and you need to ensure you are using the correct configuration.
I hope this helps and let me know if you have any further questions.
Thanks
Ashwin Kohli
CCIE#8877 (R&S, Security)
http://www.ccbootcamp.com/nliipv6labguide.asp
http://www.ccbootcamp.com/nlicciecore.asp
"Rohan Grover (rohang)" <rohang@cisco.com> wrote:Hi JC,
Nope, thats not right. The whole concept of 6to4 tunnels is that the
tunnel endpoints can be on diff subnets (as long as there is ipv4
reachability between the two edge routers)
I can ping from R2 to R3.
btw I figured out the problem, i had a static route on R1 'ipv6 route
::/0 e1/0', I changed that to 'ipv6 route ::/0 2002:c800:0001:1::2' and
everything is fine.
Which brings me to another question, any caveat in static routes with
ipv6 which says connected interfaces cannot be used?
Thanks
Rohan
-----Original Message-----
From: Jaycee Cockburn - BCX SS [mailto:Jaycee.Cockburn@bcx.co.za]
Sent: Wednesday, August 10, 2005 6:45 PM
To: Rohan Grover (rohang); ccielab@groupstudy.com
Subject: RE: ipv6 6to4 tunnels
Importance: High
Hi R,
From what I understand and according to your description your tunnel
interface ipv6 addresses is On R2
2002:c800:0001::1/64
On R3
2002:c900:0001::1/64
As you can see they are not on the same subnet...
Change on R2 tunn to 2002:c900:0001::2/64 and with the proper static
routes it should be fine...
Let me know if I'm of my rocker...
Cheers
JC
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Rohan Grover (rohang)
Sent: 10 August 2005 02:46 PM
To: ccielab@groupstudy.com
Subject: ipv6 6to4 tunnels
Hi,
I am unable to figure out one part of this feature
R1----R2------(ipv4 cloud)-----R3---R4
The ipv4 uplink on R2 is 200.0.0.1 i.e c800:0001 The ipv4 ulink on R3 is
201.0.0.1 i.e c900:0001
The ipv6 address on R1 is 2002:c800:0001:1::1/64 The ipv6 address on R2
is 2002:c800:0001:1::2/64 for the physical link and 2002:c800:0001::1/64
for the tunnel
The ipv6 address on R4 is 2002:c900:0001:1::1/64 The ipv6 address on R3
is 2002:c900:0001:1::2/64 for the physical link and 2002:c900:0001::1/64
for the tunnel
I can ping to 2002:c900:0001::1(R3) and 2002:c900:0001:1::2(R3) from R2,
which means the tunnel is functioning.
However I cannot ping to 2002:c900:0001::1(R3) and
2002:c900:0001:1::2(R3) from R1, despite having a default ipv6 route
(::/0) on R1 pointing to the physical link between R1-R2.
Am I doing anything wrong?
Thanks
Rohan
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