Chris
Thanks, the cached bridge list and the update bridge registry in 3.1 will be
nice features.
thanks for the update.
Paul
On Apr 9, 2007, at 1:06 PM, Christoph Willing wrote:
On 10/04/2007, at 5:38 AM, Derek Piper wrote:
I'm having a (possibly) similar problem with a participant in Tokyo,
Japan. I'm not sure of the way that bridges are chosen, but it seems that from
this participant's location, no bridges are available at all. I'm not sure if
it's firewalling or what that might prevent even the LIST of bridges appearing,
or what it is.
At present, all AG3 bridges are "advertised" via a single bridge registry
(at ANL) and collected into the VenueClient's bridge list when it starts up. If
the bridge registry is not contactable, for whatever reason, at startup then
the VenueClient will have an empty bridge list. Often, restarting the
VenueClient will result in a usable bridge list - it depends on why the
registry wasn't contactable; it could be that the registry was down, or maybe a
local network problem. As long as the bridge registry isn't contactable,
there'll be an empty bridge list.
AG3.1 (real soon now) caches bridge lists so that the cached version can be
used when the bridge registry is not reachable at start up. It also has an
update facility i.e. update bridge list while VenueClient is running.
The AG2 bridge mechanism is quite different - for a particular venue, a site
somehwere must be running a bridge server which explicitly targets that
particular venue in its configuration file (AG3 bridges bridge all venues).
chris
Jimmy Miklavcic wrote:
I'm working with Kansas University Medical Center to get a small
Access Grid node running. They most certainly don't have multicast available
on their campus so we are stuck with unicast. They have a "very" stringent
security policy and I'm forced to narrow down the number of bridges that they
will allow through their fire wall.
So the question is, if I give them a list of ten bridges, what are
the chances that one or two of them will be listed in the bridge registry?
Should they increase their bridge locator function from 10 to say 20 to
increase their chances of seeing any of the ten? Also, if a bridge is not
listed in the registry, does it mean that it is not available?
-- Jimmy Miklavcic
Multimedia Specialist
jimmy.miklav...@utah.edu<mailto:jimmy.miklav...@utah.edu>
UNIVERSITY OF UTAH
CTR FOR HIGH PERFORM COMPUTING
155 SOUTH 1452 EAST RM 405
SALT LAKE CITY, UT 84112-0190
Office: 801.585.9335
Fax: 801.585.5366
http://www.anotherlanguage.org
--
Derek Piper - dcpi...@indiana.edu<mailto:dcpi...@indiana.edu> - (812) 856
0111
IRI 323, School of Informatics
Indiana University, Bloomington, Indiana
Christoph Willing +61 7 3365 8350
QCIF Access Grid Manager
University of Queensland
Paul Mercer
Arctic Region Supercomputing Center
907 450 8649
