Let's say that all receivers are connected to the same router, which is one hop away. What percent of UDP multicast packets should I expect to be dropped/lost in this setup?
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1What other traffic is going through the network? – Nick ODell May 08 '11 at 22:16
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Other traffic: Several thousand HTTP requests per second to each individual server. (Clustered HTTP servers with multicast being used to coordinate servers in the cluster) – Sridatta Thatipamala May 08 '11 at 22:22
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Most packets are lost due to buffer overflows not due to the quality of the network, aside of using interference prone mediums such as radio.
So to answer, you should expect 0% dropped packets. What you will see is entirely dependent upon application load causing the incoming socket buffers to not be timely read.
Steve-o
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