Re: Review on draft-ietf-v6ops-v6-in-mobile-networks-03

[Rajeev Koodli <[e-mail]>]

Hi Tina,

Thanks for the review.

On 3/1/11 8:25 AM, "Tina TSOU" <[e-mail]> wrote:

> Comment #1
> In section 3.1, "Delaying the public IPv4 address exhaustion involves
> assigning private IPv4 addressing for end-users, as well as extending an
> IPv4 address (with the use of extended port ranges).
>  
>>> do you mean using some solution like address + port
> (http://tools.ietf.org/html/draft-ymbk-aplusp-09)?
>      If yes, where do you think Address + Port solution should be
> implemented? Maybe one of the node could be GGSN/PDN gateway, how about the
> other node, is it the mobile node or the ANG?


My personal opinion is that you would have to modify the MN.

It is not the intent of the ID to suggest location of A+P elements, as you
probably realize.

>  
>  
> Comment #2
> In section 3.1
> "An approach to  address this problem is to make the always-on PDN to be
> IPv6, and
>    enable IPv4 PDN on-demand, e.g., when an application binds to an IPv4
>    socket interface. This ensures that an IPv4 address is not assigned
>    for every attached MN, but only to those attempting to use the
>    traffic.  The IPv4 PDN may be subject to session idle timers upon the
>    expiry of which, the PDN (and the assigned IPv4 address) may be
>    deleted.  Another option specified in the 3GPP standards is to defer
>    the allocation of IPv4 address on a dual-stack IPv4v6 PDN at the time
>    of connection establishment.  This has the advantage of a single PDN
>    for IPv6 and IPv4, along with deferring IPv4 address allocation until
>    an application needs it"
>  
>>> now, and in the near future, most of the content would still be available
> in IPv4 network, not sure whether this solution could save private IPv4
> address.

Sure. However, by deferring the allocation of an IPv4 address until a PDN
and/or an application actually needs it, you also conserve the pool.

>     And this would also require some modification in the mobile devices.

Right. The operators who are interested in this already have the necessary
"bindings" - when a user clicks on an app (that requires IPv4 PDN), it
invokes the necessary PDN signaling if the PDN is not active already.

Regards,

-Rajeev


> 
> 
> We keep our promises with one another - no matter what!
> 
> Best Regards,
> Tina TSOU
> http://tinatsou.weebly.com/contact.html
> 
> 
>