Distributed Interactive Simulation
DIS-Java-VRML Working Group


click for Dis-Java-VRML home page

Multicast Backbone (MBone) Testing

Currently NPS is testing MBone connectivity. We intend to re-enable PIM in the campus routers, and use mrouted tunnels over our new Defense Research and Education Network (DREN) connection. Thanks for your patience.

Introduction

Global Multicast Session Parameters

Channel Time-to-live (TTL) scope Stream Multicast address Port Application Expected bandwidth
Coordination 127 (global) Audio 224.2.201.96 30002 rat 64 Kbps
Video 224.2.229.184 57790 vic 64 Kbps each
Text 224.2.207.212 63220 nt low
The Coordination channel provides MBone audio/video/text tools for coordinating all DIS exercises.
Connectivity check

2 alternating entities
24 hours/day
1 ESPDU/second total

127 (global) DIS Entity State PDUs 224.2.181.145 62040 see Examples page 2400 bps
Connectivity check is the default DIS PDU listening channel, fed by devo.stl.nps.navy.mil
Clients use it to check for direct multicast backbone (or multicast relay) connectivity to clients.

Please do not send on this channel! We want to keep bandwidth low enough for modem links.

dis-java-vrml testing

open to all entities
24 hours/day
low or high bitrates

127 (global) DIS Entity State PDUs _ _ see Examples page to be determined
dis-java-vrml testing is for unrestricted sending, receiving and experimentation.
Developing sensible test conventions requires further dialog and careful experimentation.

Please ensure that your streams eventually time out and stop!


25 March 98
URL: www.stl.nps.navy.mil/dis-java-vrml/codeDesign.html
feedback: brutzman@nps.navy.mil & mcgredo@stl.navy.mil