[Geopriv] Comments to draft-thomson-geopriv-lis-discovery-02

I have a few comments. The document is important for the entire HELD 
solution and hence it is extremely important to discuss it during this 
meeting.
I also suggest a wide review within the IETF very early in the process 
since these discovery aspects can cause serious delays during the IETF 
Last Call.

I think that the DHCP discovery and the DNS-based discovery shouldn't be 
in the same draft.

Terminology
------------

Use the terms we always use: IAP, ISP instead of "access networks" and 
"access network provider"

Let us use the term LCS instead of LIS.

Discovery of "PUBLIC IP ADDRESS"
----------------------------------------

There are many protocols out there that allow the end host to 
communicate with a NAT to learn the public IP address.
Now there two approaches:
* You list some of them in the document and make one mandatory to implement
* You describe the one that is mandatory to implement and indicate that 
other mechanisms may be used as welll

I prefer the latter approach. Maybe STUN would be a good approach to use.

Discovery Order
-----------------

I think that this text needs to be in HELD rather than in this document.

Extensions
-----------

I believe that the concept in general might have a broader applicability 
and hence I would suggest to generalize the work on the DNS-based 
discovery procedure to support other applications as well. I think it 
would be interesting to use this stuff for LoST as well (not in the 
current LoST document but as a future extension).

Operational Considerations
----------------------------

I also believe that the document should have a section that talks about 
the operational considerations for the DNS-based discovery approach. It 
essentially requires the ISP to have the IP addresses of the end hosts 
or the DSL routers in the DNS in order for this resolution step to work.

It is good to have an example in the text.

Ciao
Hannes

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