Re: New I-D on Carrier Grade NAT

[EricLKlein@softhome.net]

Hi Tomohiro,
Tomohiro Nishitani writes: 


> > I also think you need to consider the requirements for non-stationary
> > devices as these are starting to be more common and will complicate
> > CGN to no end as they move from one cell site to another or into a new
> > carrier while trying to maintain their IP session (most critical if it
> > is UDP based).
> > Eric
> > Eric 
> I appreciate the decirption that developing carrier-grade NATs that meet
> this set of
> requirements increase transparency of data between carrier networks. 
>
> As you indicated, I don't consider movable devices. If a carrier
> supplies wireless access
> services, it may be need to consider your indication. I think trying to
> maintain their IP session
> may not be behavior of CGN but CPE or teminal.

I am not sure how it works in 3GPP or other cellular data networks, but in 
802.16e WiMAX there is an ASN (Access Service Network ), this is a device 
that is responsible for maintaining the session as the device crosses 
between cell sites, and carriers. (The Access Service Network in WiMAX: The 
Role of ASN-GW" http://www.mustafaergen.com/asn-gw.pdf)) This device may 
also be the one responsible for DHCP(v4 and v6). 

I am not sure how a CPE would be capable of telling the network where to 
pass an UDP session on to the next base station (cell site) without loosing 
the session, thus it is a feature of the CGN (as represented by the ASN 
gateway). 

Eric