2 Qs: DNS64 on IPv4 & Bind Sharing VM

Rick Tillery rtillerywork at gmail.com
Tue Apr 3 20:10:00 UTC 2018

Thank you.  I'll check that as I configure Bind (are you referencing a
specific configuration? I've seen
& http://ipvsix.me/?p=106).  But Bind won't throw an error if it can't
access an IPv6 network/DNS, right?


On Tue, Apr 3, 2018 at 8:36 AM, Mark Andrews <marka at isc.org> wrote:

> Add exclude { ::/0; }; to the dns64 definition. It won’t prevent the
> lookup but will cause the AAAA returned to be ignored.
> --
> Mark Andrews
> > On 3 Apr 2018, at 23:14, Rick Tillery <rtillerywork at gmail.com> wrote:
> >
> > I am creating an IPv6-only subnet to test software for IPv6
> compatibility.  We just need to check that the software can function
> correctly in an IPv6 network, so prefixed IPv4 addresses work the same as
> real IPv6 addresses in this testing.  We also don't actually need access to
> the IPv6 Internet, just the IPv4 Internet, which is good, because our
> network connection is only IPv4, and we have no tunnelling.
> >
> > Using TAYGA as the NAT64, I have configured the subnet so that prefixed
> IPv4 addresses are working, and I can reach IPv4 sites.  However, I need
> DNS64 to provide name resolution to these prefixed IPv4 addresses.
> >
> > Google's DNS64 server requires access to the IPv6 Internet (according to
> Google on their support group), so it won't work for us.  So I have to
> configure my own DNS64 server, and Bind seems like just the thing.
> >
> > 1.  All the documentation for DNS64 says that when a name lookup is send
> to a DNS64 server, it first checks for an IPv6 address, and if one is not
> available, it gets the IPv4 address, prefixes it to create an IPv6 address,
> and in either case returns an AAAA record.  But can Bind be configured on
> an IPv4 domain, such that it skips the first part and just returns the
> wrapped IPv4 address in an AAAA record?
> >
> > 2.  I already have 2 VMs configured for my subnet, one acting as router,
> and the other my NAT64.  Can Bind share the Debian TAYGA/NAT64 machine, or
> do I need to create a new VM for Bind as well?
> >
> > Thanks for your help!
> > Rick
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