Check out NAT-PT (RFC-2766), one URL is:
http://www.ipv6.or.kr/english/natpt-overview.htm
> From: "Lukovszki, Csaba" <[EMAIL PROTECTED]>
>
> I would like to use on my linux a some of bidirectional
> IPv6/IPv4 network address and protocol translator.
> Unfortunatelly, I did not find any implementation.
>
> ----- Original Message -----
> From: "Donald McLachlan" <[EMAIL PROTECTED]>
>
> > > From [EMAIL PROTECTED] Wed Nov 21 13:46:42 2001
> > >
> > > Dear Colegeaus,
> > >
> > > In our laboratory we would like to investigate the situation where
> > > two Ipv4 computers are comunicating between only Ipv6 capable cloud.
> > >
> > > ------ ipv4 pkts ------ ipv6 pkts ------ ipv4 pkts ------
> > > |ipv4|-------------|ipv6|-------------|ipv6|------------|ipv4|
> > > ------ ------ ------ ------
> > >
> > > Do anybody knows what kind of translation do we have to use
> > > in IPv6 routers to make IPv4 computers to communicate.
> > >
> > > Best wishes,
> > > Csaba Lukovszki
> >
> > Do you really want header translation, or tunnelling of IPv4 through
> > IPv6?
> >
> > I've been looking at doing IPv6-in-IPv6 tunnelling. While reading up
> > on this I saw that:
> >
> > - GRE (RFC-2784) could do this but does not handle MTU discovery so it
> > looks like you'd have to do some careful MTU setting on the hosts on
> > either side of the routers. Also, the RFC [March 2000] says "IPv6 as
> > delivery and/or payload protocol is not included in the currently
> > deployed versions of GRE."
> >
> > - RFC-2473 seems more complete and should be able to do what you need.
> > 6Wind claims to have RFC-2473.
> >
> > - Cisco's tunnel command seems to allow 6-in-4 tunnels. I don't know
> about
> > 4-in-6 tunnels, or what tunnelling mechanism (read RFC) they use.
> >
> > Don
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