NATting v4 addresses to v6

[Alastair McKinstry <mckinstry@computer.org>]

Hi, 

I was wondering could you please suggest a solution to a NAT problem.

I work at a WISP, with a number of Points of Presence with local
subnets, reaced by a public gateway. That is, we have Access points with
addresses in the 192.168.1.0/24 range, with a gateway with a public IP,
eg. 1.2.3.4. I would like to be able to reach those APs to configure
them.

The solution I am investigating is using IPv6, setting up a tunnel on
the public (Debian GNU/Linux) gateway, offering 2002:0102:0304:: routes.
I would then NAT the APs, so that
192.168.1.1 <--> 2002:0102:0304::$mac1
192.168.1.2 <--> 2002:0102:0304::$mac2. 
etc. 
I can put the AAAA records in DNS by hand; DNS is not a problem, but how
can I do the NATting?

Is this possible? Can someone suggest a better way?

Thanks
Alastair McKinstry