Re: [mobile-ip] Re: FW: I-D ACTION:draft-tsirtsis-dsmip-problem-0 0.txt

On Wednesday, July 30, 2003, at 01:48  AM, Tsirtsis George wrote:

> Now, when the mobile is  not at home but in some other network, there 
> is an
> issue about what kind of v4/v6 support there is in the foreign 
> network. The
> nice thing about Mobile IP is that it is based on tunnels and thus it
> provides natural way of tunneling over networks that are not 
> compatible with
> the mobile ...if only Mobile IP could configure v4 over v6 and v6 over 
> v4
> tunnels (as opposed to just v4 over v4 and v6 over v6 tunnels). A dual 
> stack
> mobile in a v4 only foreign network would then be able to create a 
> v4&v6
> over v4 (forward and reverse) tunnel with its HA and thus maintain all 
> its
> connectivity.

Call me skeptic, but I am a little concern with the potential effect of 
double or
even worse  triple tunneling: Mipv6/Ipv6/Mipv4/IPv4
and I'm sure we could build scenarios even more frightening with various
combination of encapsulation.
I'm not worried about MTU, but about RTT and debugging.

	- Alain.