--jq0ap7NbKX2Kqbes
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Wed, Jun 18, 2003 at 03:09:17PM -0500, Frederick Bruckman wrote:
> On Wed, 18 Jun 2003, Chris Jones wrote:
>=20
> > Frederick Bruckman wrote:
> > > On Wed, 18 Jun 2003, Chris Jones wrote:
> > >>What's going on here?  Even though I have no IPv6 DNS entries, legolas
> > >>is using IPv6.  Is the 4-in-6 address translation automatic, then?
> > >
> > > The application on legolas could be using an IPv4-mapped address,
> > > which looks like IPv6 to the application, while using plain old IPv4
> > > transport. When you look at the numeric address, with "netstat -anf
> > > inet6", does it start with "::ffff"?
> >
> > Yes.
>=20
> That's what it is, then. This lets an IPv6-converted application run
> on dual-stack hosts with no IPv6 connection whatsoever.

=2E.. and without having multi-address family support. That is, you can
convert an application to IPv6-only code, and if your OS supports binding
or connecting to IPv4-mapped addresses, the application will handle them,
too. On NetBSD you can switch on this behaviour with

sysctl -w net.inet6.ip6.v6only =3D 0

However, if you do this, you'll have to be more careful in what you=20
write into your /etc/hosts.allow and /etc/services, as IPv6 address
expressions in the former and tcp6 or udp6 lines in the latter will
catch IPv4 connections, too, which might or might not what you intend.

Regards,
	-is
--=20
seal your e-mail: http://www.gnupg.org/

--jq0ap7NbKX2Kqbes
Content-Type: application/pgp-signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.1 (NetBSD)

iD8DBQE+8ZPjPCRcZ/VMtk4RAmS8AJ9/Xg7N+NbrO6itBcRVWWcG32f+rQCfVWLD
ayc9S1DMGOLaMgY3AVF1Q6Y=
=YnL2
-----END PGP SIGNATURE-----

--jq0ap7NbKX2Kqbes--