Re: WPD Discovery Options

On Mon, 03 Nov 2014 14:58:49 +0100, DIEGO LOPEZ GARCIA  
<diego.r.lopez@telefonica.com> wrote:

>>
>
>> WPD discusses discovery of proxies using a well known URI. Automatic  
>> proxy discovery may be desirable by some. The choice of
> an automatic proxy discovery method should be decided by the client.  
> Below is a selection of possible methods:
>
> mDNS / DNS-SD: the best all round solution. DNS can query a  
> well-known/predefined WPD hostname(s) and is currently supported
> by wide variety of clients. One drawback is that DNS can be spoofed so  
> would require a trusted network.
>
> PDP/PDN Context: best for working with a mobile network. It is also  
> possible to use the PDP/PDN signalling also over WiFI etc
> for configuring parameters, though in WiFi scenarios tethering can  
> become an issue: a client could detect the network type to the >next hop  
> which could be a tethered wifi connection but onwards from this point  
> could be any type of network. (Any suggested solutions
> to this are welcome!)

I think it is important to find a single method that works everywhere, if  
possible. Once that is in place, it would be possible for other actors to  
optimize that for specific domains. E.g. if we standardize on a DNS based  
discovery, you could push the relevant records to the device in PDP  
context. Higher layer code still only needs to know about a single method.

/Martin Nilsson

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