In your previous mail you wrote:
Is there any stack that can incapsulate ipv4 in ipv6 packet, making ipv4
connection over an ipv6 network ?
=> all BSD stacks have this (which is very simple). This is called gif
(which is ipvX over ipvY for any X,Y) on KAME (derived) stacks.
I use a dynamic version for DTSM (the code is available only on "INRIA"
stack today as far as I know).
For instance for a point-to-point tunnel:
gifconfig gif0 inet6 <my_IPv6_address> <his_IPv6_address>
ifconfig gif0 inet <my_IPv4_address> <his_IPv4_address> netmask 255.255.255.255 up
route change default <his_IPv4_address>
(from a real config, there are other examples in the KAME snap mailing list).
Regards
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