Re: [Geopriv] New Version Notification for draft-bellis-geopriv-flow-identity-00.txt

On 29 Feb 2012, at 16:39, Tschofenig, Hannes (NSN - FI/Espoo) wrote:

Hi Ray,

 

ports are specified in HELD identity.

Indeed, and it was my idea in the first place.

But I didn't get it right.

 

Since the idea of HELD is to find out where the entity (as described by an IP address, etc.) is I wonder why it would be useful to include the destination address and port number (which is what a flow information adds).

Because on a CGN (and some other NATs) it's possible for the same source IP / port pair to be part of lots of flows at once.

It's only the complete 6-tuple that uniquely identifies the flow, and hence the internal target behind that NAT.

Ray