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Newsflash
Host Extensions for IP Multicasting [RFC1112] specifies the extensionsrequired of a host implementation of the Internet Protocol (IP) tosupport multicasting. The multicast addressess are in the range224.0.0.0 through 239.255.255.255. Current addresses are listed below. www.iana.org/assignments/multicast-addresses
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Internet Group Management Protocol Fails In A Radio LAN Environment
Written by Administrator
Saturday, 09 August 2008Internet Group Management Protocol Fails In A Radio LAN Environment
To those that think IP Multicast works in a radio environment there is one little problem. IGMP is not a reliable protocol. How IGMP attempts to gain reliability is by sending several copies of its messages. For example; the IGMP join group message will be sent several times, after all, isn’t it ok as long as the intended receiver of the IGMP message is aware of this “feature”. The problem is when it comes to the radio LAN environment packet loss is often so high that those little IGMP packets are often stepped on.
Last Updated (
Saturday, 09 August 2008 )
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FEC Alone won't do!
Written by Administrator
Tuesday, 31 July 2007Why FEC alone won’t do!
Forward error correction is beginning to get some votes on the ipmulticast.com poll, but FEC alone can’t give us Reliable IP Multicast. There are several reasons for this:
· Latency – FEC or spread spectrum FEC is going to increase latency during channel changes.
· Conspicuous consumption – In order to support a Radio LAN you have to send a LOT of FEC. Like 10 times the data in a noisy situation. In a radio LAN environment packet out-of-order and packet loss drive consumption beyond acceptable levels.
· Packet loss again – Yup', when your in a noisy environment, there aint' no' formula that accomplishes a perfect data transfer. There will always be a significant chance that the same redundant data will be lost multiple times.
· If one dynamically scales FEC (as some have proposed) then a congested network will signal to send more FEC and hence a more congested network. Unless we do something as lame a stepping down to the lowest receiver in the network.
So keep those thinking hats on because we aren’t quite there yet!
Sorry but FEC alone won’t do! Ian A. Stewart
Last Updated (
Tuesday, 07 August 2007 )
A solution to the Multicast Problems?
Written by Administrator
Tuesday, 31 July 2007We need a solution!
We need a software-based solution for large-scale delivery of video (or data) on the Public Internet.
IP delivered linear channels are sprouting up, but how will they conquer the point to-point delivery problems associated with IP video? Even Akamai’s huge and expensive “edge” delivery system, which uses the Internet Engineering Task Force’s Real Time Streaming Protocol (RTSP), is limited to about 300,000 simultaneous viewers.
The CBS March Madness sporting event is a detailed exploration of the point to-point video delivery problems and corresponding limitations. Despite this event’s success at serving approximately 300,000 viewers, many more potential viewers were frustrated and had to wait in line.
Stanford University professor, Steven Deering invented the system we need (thanks Steve), but Deering’s specification – which he called “IP Multicast” – was not a reliable protocol (set of rules). IP Multicast is prone to a percentage of data (or packet) loss. Deering’s “IP Multicast” protocol was never intended to be a complete solution, just a “building block.”
The IETF has made an effort to design a scalable system for Reliable IP Multicast. Their best effort to date was originally called PGM, which stood for "Pretty Good Multicast." Unfortunately, they have a separate group working on the Security and Reliability of the IP Multicast transmissions. This has led to lack of interoperability between the Security and Reliability of the IETF’s systems; they are separate systems (proposals actually) creating lack of co-ordination and efficiency. Hence, World Multicast came up with a new solution (and definition) – The Secure/Reliable IP Multicast. By combining security and reliability into the same SMART process, we have increased efficiency and “interoperability.”
So let's solve this in the field, where we can really test the ideas, let us wait no more for Mr. Big to give a thumbs up! If we do that, we are liable to get strapped helping the "cronies" get more market share!
Come on Troops! We can do it!
Ian A. Stewart
Last Updated (
Tuesday, 07 August 2007 )
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