Subject: [Geopriv] RE: [Ecrit] thomson-geopriv-lis-discovery-03

From: "Thomson, Martin" <[email-masked]>
Date: Thu, 29 Nov 2007 23:34:19 -0600

(Bring this back to Geopriv...)

Hi Cullen,

Thanks for your comments.

Re 1.2: HTTP-based services require a path as well as a host and port.  We would have to bastardize HTTP to avoid that.

Re 4.2.1.1: UPnP is specifically suggested because the way that it works is to find the next layer out from the Device.  We aren't looking for a public address; instead, we are actually looking for an address in the next nearest network layer.  This is on the assumption that a LIS in that layer is more likely to be able to locate us.  (Actually, the piece of UPnP that is required is relatively small - perform discovery, find devices that support the WANIPConnection profile, call GetExternalIPAddress on that device).

The reason that we can't rely on the domain name is that a domain name extracted from a device like a home router isn't useful for discovery.  Note that the home router case also drives the UPnP recommendation, particularly for layered NAT.

Ta,
Martin

> -----Original Message-----
> From: Cullen Jennings [mailto:[email-masked]]
> Sent: Friday, 30 November 2007 2:42 PM
> To: ECRIT
> Subject: [Ecrit] thomson-geopriv-lis-discovery-03
> 
> 
> This does a nice job of laying out the options. Few questions ...
> 
> Section 1.2. Do we really need to discover a URI or would host, port,
> and type of protocol be enough? If so, SRV would be simpler and more
> widely supported.
> 
> Section 4.2.1.1 UPnP would not work in many of the cases we are
> interested in such as layered NAT and even worse it may not be
> possible to detect this failure. I would not be in favor of UPnP
> unless it really was the only solution. It is also very complicated
> to spec the exact parts of it you would need - UPnP is a lot of things.
> 
> Do we have any idea how common DHCP without a domain name option is?
> I'm wondering if people would bother to implement way to get IP for
> reverse IP approaches.
> 
> Cullen <with my individual contributor hat on>
> 
> 
> _______________________________________________
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> [email-masked]
> https://www1.ietf.org/mailman/listinfo/ecrit

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