DVMRP Multicast Video Example
The figure below shows the network configuration for the example:

Equipment Required
- 3 Pentium class machine with Windows 95
- 3 Multicast-Capable Network Interface Cards
- IP/TV software
- GIGAswitch/ATM
- 3 IP Switch Gateways with 10/100 Ethernet Adapters
Server Installation
- Unpack the iptvsrv.exe file into a sub-directory on
the local hard disk.
- Proceed through the installation menus and reboot when prompted.
- The program should have installed itself onto the start menu. From
there you can start the program.
- The server program is set up to serve multicast files to any of the
receiving clients. The server is configured through a set of files in the
windows directory. The default file is c:\windows\sample.svr.
- This file must be modified to set the TTL (time to live) variable higher
than normal. Default is one, for local net. This is accomplished by editing
the file and changing the strings:
cvideo=IN IP4 239.255.0.1/1 for the video to cvideo=IN
IP4 239.255.0.1/8
and
caudio=IN IP4 239.255.0.1/1 for the audio to caudio=IN
IP4 239.255.0.1/8.
- This file should be changed to view a video file larger than the default
one provided. This is done by modifying the c:\windows\sample.svr
file and changing the string:
a10=file:c:\avi\sample.avi to be a different file such
as c:\avi\ipsilon.avi.
- The modified file can be saved under a different file name, but must
retain the .svr extension.
- When you start the IP/TV server from the start menu, you get the standard
guide screen. You should use the Options menu to configure the IP/TV
server. Your server name should be the DNS name of the computer that the
server is installed on. All other options can be left alone.
Client Installation
- Unpack the iptvsrv.exe file into a sub-directory on
the local hard disk.
- Proceed through the installation menus and reboot when prompted.
- The receiving client is configured by the file c:\windows\sample.sdb.
This file shouldn't have to be changed as the default multicast group address
for the server is used.
- At this point, the program has installed itself onto the Start
menu, and from there you can start the program.
- From the File menu and Launch Session option you should
open the sample.sdb file from the c:\windows
directory. This will proceed to subscribe your client to that particular
multicast group and a separate window will appear. This window will contain
the video clip once the server begins broadcasting.
Starting Multicast video
- Upon launching the IP/TV server, you are presented with the guide.tvg
screen. Using the File menu, and Launch Session option, you
can open the sample.svr file in the c:\windows
directory or the modified .svr file that was created earlier.
- Once you launch the IP/TV server session, you will see the server screen
and the session statistics. It quickly minimizes and you must maximize
it. By pushing on the green Play button, the video begins to play.
The video on the server is never smooth and is not a true representation
of what is being broadcast. The image on the clients, however, will appear
normal.
- If there are any IP/TV clients within 8 router hops away they will
be able to view this video.
Copyright © 1997 Ipsilon Networks, Inc.
Portions copyright © Digital Equipment Corporation 1998. All rights reserved.
Updated January 8, 1998
Send comments to Digital Equipment Corporation, doc-quality@lkg.mts.dec.com