Re: [Mip6] [issue94] fixing encapsulation mechanism in IPv4 network

[Romain KUNTZ <kuntz at sfc.wide.ad.jp>]

Hi Shima-san,

Keiichi SHIMA wrote:
> I may not agree on the above point.  Since UDP is a transport protocol, 
> encapsulating something in it cannot be handled by a *normal* packet 
> decapsulation flow, while IPv4-in-IPv4 can be fit to the natural flow.  
> So switching from IPv4 encapsulation to UDP encapsulation may not be so 
> easy as you say, especially for MIP stacks that are implemented in user 
> space.
>
> I would like to hear opinions from who have already implemented DSMIPv4.

On linux, we perform UDP encapsulation/decapsulation for signaling using 
the packet transformation framework XFRM. Encapsulation/Decapsulation is 
thus performed in the kernel space.

We can easily switch from one mode to the other from the userland 
through netlink (socket-based interface for communication between kernel 
and userland processes).

XFRM is very flexible and rather easy to extend to implement parts of 
the DSMIPv6 spec.

Regards,
--
Romain KUNTZ
kuntz at sfc.wide.ad.jp

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