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Re: A host who has private IPv4 address can communicate with IPv6 host globaly by 6to4 tunnel



In fact, it will be very good if you can tell me (private email to avoid brands/models here) what router or NAT box are you using,
so I can include it in my survey.

Same for other people that has used this ;-)

Regards,
Jordi

PS: By the way, yes, you can use any of the computers after the NAT as the IPv6 router. I'm doing it right now, in my hotel room,
and I see some other people using my IPv6 prefix, for free, being my laptop the router ! You can read the last draft (-02 waiting in
the editors queue) and also this document
http://www.euro6ix.org/documentation/euro6ix_co_upm-consulintel_wp4_ipv6_tunnels_nat_v1_6.pdf.

----- Original Message ----- 
From: "Tim Chown" <tjc@ecs.soton.ac.uk>
To: <ipv6@ietf.org>
Sent: Wednesday, October 22, 2003 6:28 PM
Subject: Re: A host who has private IPv4 address can communicate with IPv6 host globaly by 6to4 tunnel


> Hi,
>
> Yes, this will work.  This technique is quite widely used, and is one
> reason for this draft:
> http://www.ietf.org/internet-drafts/draft-palet-v6ops-proto41-nat-01.txt
>
> Essentially you forward the protocol 41 from the NAT to the internal host.
>
> It is quite a popular "trick" with our students in their home DSL LANs.
>
> The problem is that this only works for one host within the NAT network,
> so if the NAT encompasses many sites, you're stuck.
>
> Cheers,
> Tim
>
> On Wed, Oct 22, 2003 at 07:03:44PM +0900, Jisuek.Lim wrote:
> >
> >    Hello all,
> >
> >    I have a idea about communication method with 6to4 tunnel.
> >
> >    Generally,  we think a host who has private IPv4 address(because it is
> >    behind  NAT  device)  can  not  communicate with IPv6 host globally by
> >    tunneling(6to4,  config  tunnel  ..)  But  there  is  a way using 6to4
> >    tunnel.
> >
> >    When  we config 6to4 config on a host(for example windows2000 station)
> >    we  assign  the host's IPv4 address to the host's 6to4 address(next to
> >    2002:).  And  we  know  the  host's  IPv4 address shoud be public IPv4
> >    address.
> >
> >    But,  if  we  use  the  public  IPv4  address which is on NAT device's
> >    external  interface  to  make  the  host's  6to4 address, the host can
> >    communicate  with  IPv6  host  globally  using  6to4  tunnel and relay
> >    router. Following are do list.
> >
> >    1.       Map the NAT device's public address(select one) to the host's
> >    private address(configure on the NAT)
> >
> >    2.        On  the  NAT  device,  make  a policy which permit incomming
> >    traffic which has protocol number 41 to the host's private address
> >
> >    3.        Change  the  NAT  device's  public  IPv4  address(which  you
> >    selected) to hex. format.
> >
> >    4.       Configure the host's 6to4 address using upper hex.
> >
> >    5.        Add  route  table  for 2002 traffic to tunnel interface, and
> >    ::/0 to relay router(relay router is provided by some orgnization)
> >
> >
> >    And  then,...try ping6 to any IPv6 address. following is the result of
> >    my own test.
> >
> >
> >    C:\>ping6 6to4.ipv6.fh-regensburg.de
> >
> >    Pinging 6to4.ipv6.fh-regensburg.de [2002:c25f:6cbf:1::1] with 32 bytes
> >    of data:
> >
> >
> >    Reply from 2002:c25f:6cbf:1::1: bytes=32 time=330ms
> >
> >    Reply from 2002:c25f:6cbf:1::1: bytes=32 time=329ms
> >
> >    Reply from 2002:c25f:6cbf:1::1: bytes=32 time=329ms
> >
> >
> >    C:\>
> >
> >    C:\>ping6 www.kame.net
> >
> >
> >    Pinging  orange.kame.net  [2001:200:0:8002:203:47ff:fea5:3085] with 32
> >    bytes of data:
> >
> >
> >    Reply from 2001:200:0:8002:203:47ff:fea5:3085: bytes=32 time=117ms
> >
> >    Reply from 2001:200:0:8002:203:47ff:fea5:3085: bytes=32 time=72ms
> >
> >    Reply from 2001:200:0:8002:203:47ff:fea5:3085: bytes=32 time=68ms
> >
> >    Reply from 2001:200:0:8002:203:47ff:fea5:3085: bytes=32 time=71ms
> >
> >
> >    C:\>
> >
> >
> >    Following is my computer's IP config
> >
> >
> >    C:\>ipconfig
> >
> >
> >    Windows 2000 IP Configuration
> >
> >
> >    Ethernet adapter :
> >
> >
> >            Connection-specific DNS Suffix  . :
> >
> >            IP Address. . . . . . . . . . . . : 192.168.1.60
> >
> >            Subnet Mask . . . . . . . . . . . : 255.255.255.0
> >
> >            Default Gateway . . . . . . . . . : 192.168.1.254
> >
> >
> >    C:\>
> >
> >
> >    as you know 192.168.1.60 is private address !!
> >
> >    Try it.
> >
> >    Thanks.
> >
> >    Jisuek. Lim
>
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