Unclassified
White Paper - Issues in Collaboration
Network Issues
Conflicts between IPv4 Multicast, ATM Multicast & IPv6 Multicast
Issues / Conflicts between Multicast of dissimilar networks
Are there effective gateways
how effective is Multicast over JWICS and SIPRnet considering the need
for tunneling in order to accommodate non-Multicast routers, ATM tunnels
& firewalls
What are the security policies for IP Multicast, considering IP encapsulated
data through firewalls (regarding source, data and recipient and the inability
to track the ultimate recipients)
There is a need for:
A Router map / diagram of existing Multicast routers / tunnels
Models of how the routes are laid out
Communications Infrastructure
Issue is which bandwidth reduction scheme should be used
Security Issues
Need security policy to address Multicast tunneling (firewalls, non-Multicast
routers, etc...)
Does Multicast support security policies
If Multicast is used: Technical guidance for firewalls and gateways
is needed
Efficiency Issues
Architectural design that shows implementation guidelines
Formula to determine effectiveness
Address assignments
Threshold of Consideration
Before Multicast should be considered the following formula should
be used:
[(maximum number of users on local network segment - 1) x (maximum
number of Multicast enabled shared router hops between any 2 segments {daemons
do not count}) x (number of sites - 1) > 2
Note: HOPS = communication between Multicast enabled routers
Guidance Issues
Migration from IPv4 Multicast to IPv6 Multicast
Need someone to provide implementation guidelines
Size and distribution of group in which Multicast is effective
Do Multicast daemons policies exist
Other Issues
Audio inter-operability
Video Teleconferencing audio standards published by ITU
(G.711, G.722, G.728) have patent issues pending
G.723
Voice over IP
GSM (cell phone compression
LPC-1
Military Audio Codecs
LPC-10 (2400 Baud)
CELP (4800 Baud)
Recorded products
Broadcast Video
18 June 1997