[dsdp-tm-dev] Re: Zeroconf

[Martin Oberhuber <martin.oberhuber@xxxxxxxxxxxxx>]

Hi Scott,

thanks a lot for all these hints.
I'm forwarding this to Javier Montalvo Orus from Symbian, who's mostly 
been involved with autodetect for the TM project.

We're discussing this on
 http://wiki.eclipse.org/index.php/DSDP/TM/Autodetect
and
 https://bugs.eclipse.org/bugs/show_bug.cgi?id=140320
but you could also just send an E-Mail to mailto:dsdp-tm-dev@xxxxxxxxxxx.

When I got it right, Javier already knows about dns-sd, and actually 
some of his research actually started from their website (it was in one 
of his early E-Mails).
Anyway, the pointer to the book is certainly helpful, just like your 
note about domains.

Thanks!
Martin

Scott Lewis schrieb:

> Hi Martin,
>
> I can't remember the name/email address of the person on DSDP team 
> that was looking into this, so I thought I would send to you so your 
> could forward to appropriate person.
>
> Over the weekend I happened to read the book:  Zero Configuration 
> Networking: The Definitive Guide
> http://www.amazon.com/gp/product/0596101007/ref=pd_cmp_rvi_1_i/104-7671427-2556769?n=283155 
>
>
> In it, I clarified for myself how zeroconf deals with discovery 
> outside of LAN...it's via DNS.  In short, the 'names for service 
> types' are setup as DNS entries...e.g.
>
> _http._tcp.local
>
> or
>
> _http._tcp.eclipse.org
>
> so the service instances will look like this
>
> Scott Web Server._http._tcp.local
>
> zeroconf will use a DNS query to get information about the service.  
> This requires a DNS server that has been set up as a 'dns-sd' (for DNS 
> service discovery) server.
>
> So here's an example config for DNS server that would allow it to 
> respond to dns-sd queries ('b' is for browse below):
>
> b._dns-sd._udp         PTR   @
> lb._dns-sd._udp         PTR   @
>
> _httpd._tcp               PTR   Scott\ Web\ Server._http._tcp
> Scott\ Web\ Server   SRV   0 0 80 www
>                                 TXT   path=/
>
>
> So, in any event, with a properly configured DNS server zeroconf (and 
> ECF impl) should allow cross-lan access to service discovery.
>
> DNS service discovery org URL:  http://www.dns-sd.org
>
> I assume this helps WRT desired DSDP usage.  Please let me know if I 
> can be of any further help in this regard.  One thing...the 
> dns-sd/zeroconf protocol allows for 'domain discovery'...i.e. to 
> discover *domains* (e.g. eclipse.org) that are known.  The ECF 
> discovery API does not *yet* support this, but it would be easy to 
> add, so I'm thinking of doing so.
>
> Thanks,
>
> Scott