RE: [Mip6] concensus on [issue94] fixing encapsulation mechanism inIPv4 network

["Sri Gundavelli" <sgundave at cisco.com>]

I prefer option "A". 

Reason:
>From the MIP4 experience, many times and for various reasons,
deployments choose UDP Tunneling even in the absence of NAT. The
ability for the client to hint that choice from any connected
network is important. I remember at least in one case, the UDP
tunneling was required by the client over satellite link, for some
reason, using RBSCP ..., there was no NAT in the path. So, the
negotiation logic in 3519 works quite well, IMO. We should probably
go with the same logic.



HA (Forced Accept)
==================
a.) NAT Present

Always enable UDP tunneling

b.) NAT not present

Enable UDP tunneling if the MN sets the bit



HA (Forced Reject)
==================

a.) NAT Present

Always enable UDP tunneling


b.) NAT not present

Do not accept UDP tunneling, even if the client requests it.


Besides the "U" bit in the request, the HA should have some
config policy on to accept "forced" UDP tunneling or not. So,
the final control can be given to the HA in the form of policy, 
but the client should be able to specify its preferences.


Sri



-----Original Message-----
From: Hesham Soliman [mailto:Hesham at elevatemobile.com] 
Sent: Wednesday, March 28, 2007 12:33 AM
To: 'Keiichi SHIMA'
Cc: mip6 at ietf.org
Subject: [Mip6] concensus on [issue94] fixing encapsulation mechanism inIPv4
network

Kiichi, all, 

I think we've seen the different angles of this issue now and it's time to
close it. 
So I suggest that we choose one of the two options listed below. 

Folks, 

The "new" issue is about whether or not the MN can request one form of
tunnelling (i.e. UDP) when sending a BU to the HA. The two choices we have
are:

A. Add a flag that allows the MN to request UDP tunnelling interface
(independently of the presence of a NAT) from the HA, when sending the BU.
The HA can override the MN's request. Or, 

B. Do nothing. I.e. the MN sends the BU as described in the spec today and
the HA tells the MN in the BA whether it should use UDP tunnelling or IP in
IP. 

Please express your preference for one of the options above. Let's not make
things complicated and get into negotiating the tunnelling mechanism, one of
the two above will suffice. 

I'll leave it open till next Tuesday. 

Thanks,
Hesham



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