On 2010-04-21 at 19:37 -0600, Yves Dorfsman wrote:
> Phil Pennock wrote:
> > On 2010-04-18 at 11:42 -0600, Yves Dorfsman wrote:
> >> addresses on the public internet. I only used one, so I turned that off, 
> >> and 
> >> pointed to a public stun server (who fund those? all of them seems to be 
> >> aliases to an amazon EC2 node!),
> > 
> > stun.l.google.com
> > 
> > I'm fairly sure that's not an Amazon EC2 node.  ;)
> > 
> > I also don't know whether or not that's a publicly supported interface
> > or an implementation detail, but it currently works.  I'm not in a
> > position to give any promises about whether it will continue to work.
> 
> Does it? Not working for me:

Oops, non-standard port.  First result from a Google search for [stun
stun.l.google.com] is:
  http://code.google.com/p/natvpn/source/browse/trunk/stun_server_list

which leads me to:

% stun_client stun.l.google.com:19302
STUN client version 0.96
Primary: Open   
Return value is 0x000001

and on a VM on my laptop at home:
% stun stun.l.google.com:19302
STUN client version 0.96
Primary: Independent Mapping, Independent Filter, random port, will hairpin     
Return value is 0x000002

Normal port is 3478, but that's only a SHOULD and the STUN spec (RFC
3489 -- boy did they miss an opportunity with that port/RFC numbering)
mandates use of SRV for stun server discovery anyway, and the Google
XMPP extensions for voice/video (Jingle) provide XML config to set stun
servers.  So, as I note, the above host/port is very much an
implementation detail.

But until it changes, if it ever changes, it's definitely not an Amazon
EC2 node and should be pretty reliable.  :)  It's what I shove in my IM
clients (pidgin, Adium) and I accept that one day I might have some
awkward debugging to do, if it should move.

-Phil, speaking in personal capacity.
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