RE: [mobile-ip] Re: FW: I-D ACTION:draft-tsirtsis-dsmip-problem-00.txt

[Tsirtsis George <G.Tsirtsis@flarion.com>]

Alain,

I am not sure where Mipv6/Ipv6/Mipv4/IPv4 comes from in your e-mail and I am
not even sure what it means. MIPv4 and MIPv6 are signaling protocols....and
do not introduce overhead in the data path.

We can always complicate things but why not deal with the simple and by far
most important issue.

Today Mobile IP signals HoA to CoA bindings of the same version resulting in
either IPv4 over IPv4 encapsulation or IPv6 over IPv6 encapsulation.

All I am suggesting is that Mobile IP should be able to signal HoA to CoA
bindings of different versions so that IPv4 over IPv6 encapsulation or IPv4
over IPv6 encapsulation is also possible.

George

-----Original Message-----
From: Alain Durand [mailto:Alain.Durand@Sun.COM] 
Sent: Wednesday, July 30, 2003 6:19 PM
To: Tsirtsis George
Cc: Mobile-Ip (mobile-ip@sunroof.eng.sun.com); v6ops@ops.ietf.org; Soliman
Hesham; 'Thomas Narten'
Subject: 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.