[c-nsp] IPv6 DualStack and NAT-PT

[Yucel Guven]

Hi all,
Assume a small subnetwork including both IPv4-Only and IPv6-Only hosts
(they are in the "same subnet", such a heterogeneous subnet :) . 
I want all of these hosts/servers to communicate with outside IPv6 and
IPv4 networks and with each other inside the subnet.
Is it better to isolate IPv4 and IPv6 and use NAT-PT rtr between them?

Anybdy experienced/used such an IOS that support both DualStack and NAT-PT?

My case:
H1: IPv4-Only   and H2:IPv6-Only
          __
+---+     |
|H1 |------|
+---+     |          +----+--------------------> To IPv6 sites
            |----------|  R  |
+---+     |          +----+--------------------> To IPv4 sites
|H2 |------|          Rtr ?Dual+NAT-PT?
+---+     |
           ---
          SmallSegmnt

Any idea will be appreciated, TIA,
- Yucel