[Openswan Users] IPv4-in-IPv6 / IPv6-in-IPv4

Paul Wouters paul at xelerance.com
Thu May 14 19:10:50 EDT 2009

On Thu, 14 May 2009, Michael H. Warfield wrote:

> 	Seems like it is now possible with Linux kernels 2.6.21 and greater to
> support IPv4-in-IPv6 tunnels and IPv6-in-IPv4 tunnels in tunnel mode.
> 	Seems to have already been incorporated into StrongSWAN.  Any plans for
> this in OpenSWAN?  This is the one thing for which I still keep OpenVPN
> around - roadwarrior IPv6 over IPv4.

> 	StrongSWAN claims to make reference to XFRM_STATE_AF_UNSPEC in order to
> perform that trick and I don't see that in any of the OpenSWAN files.
> 	I don't want to engage in a feature war between the three different
> projects but that IPv6-in-IPv4 tunnel would be very useful.

This is something our GSoC student can pick up :)

If Strongswan added the support for this in ikev1 as well, it means that
they already made the pluto code changes, and it would be very easy to
port. Otherwise, it would involve a little more effort.


More information about the Users mailing list