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Providing aNativeIPMulticastInterfacetoApplicationLayerMulticast
4/4/06
Providing?a?Native?IP?Multicast?Interface?to?Application?Layer?Multicast
1
Providing?a?Native?IP?Multicast?Interface?to?
Application?Layer?Multicast
Dragan?Milic,?Marc?Brogle,?Torsten?Braun
4/4/06
Providing?a?Native?IP?Multicast?Interface?to?Application?Layer?Multicast
2
Overview
Why?is?there?no?Internet-wide?IP-Multicast?
Overlay?Multicast?/?Application?Layer?Multicast?(ALM).
Multicast?Middleware:?ALM?with?an?IP-Multicast?interface.
— Providing?a?native?IP-Multicast?interface?to?applications.
— Distributing?Multicast?traffic?using?ALM.
— Prototype?implementation.
Example?of?an?ALM?Integration:?NEMO.
Outlook.
4/4/06
Providing?a?Native?IP?Multicast?Interface?to?Application?Layer?Multicast
3
Why?is?there?no?Internet-wide
IP-Multicast?
At?the?moment,?the?Internet?consists?of?IP-Multicast?islands:
— ISPs?are?not?always?interested?in?mutual?cooperation.
— Forwarding?IP-Unicast?traffic?is?“easier”?(stateless)?than?
forwarding?IP-Multicast.
— ISPs?fear?the?additional?traffic?induced?trough?IP-Multicast?(easy?
DoS?attacks?trough?joining?high?traffic?volume?Multicast?groups).?
Multicast?islands?are?interconnected?with?tunnels:?MBONE?[1].
— Manual?setup?of?tunnels.
— Administrative?overhead.
Consequence:?most?of?the?Internet?end-users?cannot?profit?
from?IP-Multicast?services.
4/4/06
Providing?a?Native?IP?Multicast?Interface?to?Application?Layer?Multicast
4
Overlay?Multicast
An?alternative?to?relying?on?IP-Multicast?availability?is?to?
approximate?Multicast?data?distribution?using?only?Unicast?
communication?(routing?trough?an?overlay?network).
— Advantages:
– Can?minimize?(but?not?eliminate)?redundant?transmission?of?data?
trough?the?links.
– Does?not?require?modification?of?network?elements?(routers).
– Can?be?implemented?on?the?application?layer?–?no?need?for?special?
operating?system?support.
— Disadvantage:?topology?of?an?overlay?network?is?almost?always?
less-optimal?than?the?topology?of?the?underlying?network?→?the?
ALM?routing?is?less?efficient?than?a?
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