The Sdr Global Session Monitoring Effort is an effort to track, manage,
and present information about the availability of world-wide sdr sessions.
The basic idea is that if a number of people in topologically and geographically
diverse places around the world send email to the system with their sdr cache
entries we can put together a WWW page showing what sdr entries are being
seen by what parts of the world. This type of service has provided many useful
functions. For example, if someone is trying to advertise a session they
can check the "sdr-monitor" WWW page to see what percentage of sdr-monitor
sites around the world see their session.
Sdr-monitor has been used by the multicast community to track and manage multicast session announcement availability as well as to detect potential multicast reachability problems since April 1999. At this point in time (October 2003), we feel that sdr-monitor has completed its mission and we have decided to discontinue our monitoring effort. For multicast users interested in monitoring multicast connectivity in the Internet, we refer them to Multicast Beacon Project which is a follow up project performing active measurements among a large number of multicast enabled user sites in the Internet.
During our monitoring effort, sdr-monitor had over 100 participants helping us to collect multicast reachability information by running a piece of script in their sites. We thank all of our participants for their help in realizing this project.