IPv4/IPv6 dual-stack, IPv4-only and IPv6-only

[Francesco Casadei]

On Mon, Jul 14, 2003 at 04:46:40PM +0000, othermark wrote:
> Comments in-line:
> 
> In article <20030713105532.GA856 at goku.kasby>, Francesco Casadei wrote:
> > 
> > --UlVJffcvxoiEqYs2
> > Content-Type: text/plain; charset=us-ascii
> > Content-Disposition: inline
> > Content-Transfer-Encoding: quoted-printable
> > 
> >    I need to setup an IPv4/IPv6 dual-stack host,
> 
> This works as default.  Just ifconfig your ipv6 address.
> 
> > IPv4/IPv6 dual-stack host connected to the 6bone through freenet6. 
> 
> Works with the freenet port.  What this basically does is tunnel the
> the ipv6 traffic between two ipv4 hosts.
> 
> > act as an IPv6 gateway for the other PC, configured as an IPv6-only host and
> > IPv4-only host by installing twice FreeBSD and using dual-boot.
> > 
> >    Is this possible to achieve? Does anybody know how to do this? Furthermo=
> 
> Your setup is reasonable.  You don't even need to dual boot the client
> behind the firewall, let it run dual/stack too.  However, your setup 
> will work the best if both the firewall and the client have publicly
> routeable ipv4 addresses.  In other words NATing ipv4 via your
> firewall will probably break things.  Ipv6 traffic from your client to 
> your freenet6 enabled ipv6 router should work just fine.
> 
> > re,
> > how can an application detect system's configuration (IPv4/IPv6, IPv4-only,
> > IPv6-only)?
> 
> By looking at the configured address.  Most applications that are
> enabled for ipv6 are capable of running both ipv4 or ipv6 by
> abstracting the ipaddress type and changing to use a few different
> function calls (inet_ntop and inet_pton mainly).
> 
> ---
> Mark
> atkin901 at NOSPAM yahoo dot com
> (!wired)?(coffee++):(wired);
> 
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> end of the original message

   I'm already trying to configure a 6to4 tunnel to the 6bone through
freenet6, but as you've pointed out it doesn't work with a private IPv4
address behind NAT.

   I don't have a public IPv4 address to do static NAT to the dual-stack
host, so I will try to set the router in bridge-mode and use PPTP-to-PPPoA
and mpd to connect the dual-stack host to the Internet with the public IPv4
address given by my ISP.

   Regarding my previous question ("how can an application detect system's
configuration?"), what I was really asking is: a failing socket(AF_INET, ...)
syscall with error EINVAL can be considered a test for an IPv6-only host?
Similarly, a failing socket(AF_INET6, ...) syscall with error EINVAL can be
considered a valid test for an IPv4-only host?

		Francesco Casadei
-- 
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