Hi all,
I haven't received concerns regarding the suggested discovery approach.
May I assume from the lack of feedback that the suggested approach is
reasonable?
Ciao
Hannes
Hannes Tschofenig wrote:
Hi all,
I would need some feedback regarding work that is currently being done
in the GEOPRIV working group.
For some time we have been working on an application layer protocol
that allows the end host to obtain its own location information (or a
reference to it) from a server (called LIS) in the access network.
This LIS indeed needs to be located in the access network (and not at
an arbitrary place on the Internet) since only the layer 2/layer 3
provider is able to determine the precise location of end point.
A year ago I lead a design team that captured the problem statement
and requirements. The document is available here:
http://www.ietf.org/internet-drafts/draft-ietf-geopriv-l7-lcp-ps-05.txt
The protocol that provides the functionality of the above-mentioned
requirements document is HELD:
http://tools.ietf.org/html/draft-ietf-geopriv-http-location-delivery
Providing the end host with the address of the LIS is relatively easy
if you can use DHCP. However, there are deployment environments (such
as DSL networks) where the DSL operator cannot control the DSL home
routers and any information that is provided by the DSL operator may
not be relayed to the end host via this box.
So, to overcome this issue the group had an idea: Let's use a
different discovery technique that does not require upgrades to
intermediate devices (such as this DSL home router).
In short, the current proposal (see
http://tools.ietf.org/html/draft-thomson-geopriv-lis-discovery-02.txt;
ignoring Section 2 which defines the DHCP portion) essentially does
the following:
* Discover the public IP address of the end point
* Perform a reverse DNS lookup to learn the domain
* Lookup the LIS for that domain
* Contact the LIS
We have investigated other solutions as well (see Section 4 of
http://www.ietf.org/internet-drafts/draft-ietf-geopriv-l7-lcp-ps-05.txt)
but the group (or at least a few folks) believes that this is a "good"
approach.
I had a chat with Jari and we both agree that this topoic falls into
the expertise of the Internet Area. Hence, I would like to solicit
feedback from you.
Ciao
Hannes
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