Re: [shara] Shara scope

Hi, 

On 28/01/09 10:03 PM, "teemu.savolainen@nokia.com"
<teemu.savolainen@nokia.com> wrote:
> Hi,
> 
> I ment that there's no need to work here about how NATs work (or how those are
> traversed) in general, but indeed the coexistence with NATs and placement of
> NAT are of interest.
> 
> While new phones could be containing support for this feature, the old ones
> definitely would not. Thus the gateway serving large number of terminals would
> need to provide public IPv4 address or NAT for some while letting others use
> shared addresses. And this distribution would likely change as legacy devices
> would go away and new ones come in, and even more so when IPv6 becomes common.

if i recall correctly, Alain said something very similar... just he wasn't
talking about phones. :)

> About the signaling. On the DHCP-based solutions, I think (at least in our
> proposal solution) the signaling could work by node sending in DHCPDISCOVER
> indication of its support for shared addresses, and with that it would
> implicitly indicate no need for NATting by the delegating host (if it indeed
> delegates shared addresses).

just an initial list of bullet-points what needs to be signaled. (I think
its identical with what you said...):

- a set of public IPv4 addresses,
- for each IPv4 address the allocated port-range,
- the tunneling technology to be used
  (e.g., "in-IPv6-encapsulation", or in your case that you have layer-2)
- addresses of the tunnel endpoints (e.g., IPv6 address of tunnel endpoints)
- whether or not NAT functionality is provided by the gateway

anything missing besides a version number and some reserved bits for future
use? :)

> On the chain of delegating nodes the first node
> that does not indicate support for shared addresses in its DHCPDISCOVER
> essentially indicates to the node above to provide private IPv4 address and
> instantiate NAT.

agreed. 

    olaf

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