Deliver message to all peers in rtmfp

Hi!
How can I send some data to ALL peers via p2p-network?
I tried using netgroup.post() but not all users recieved this messages.
Then I tried to get peers to resend ( via post() ) all the data they have received - this works well, but produces large amounts of additional traffic for all peers (3х-5х and more)
Is there a way guaranteed to deliver a message from the server to all peers? (not sending data from a server directly to each peer)
Thanks!

Yes, I tried object replication also. It works but take too much time.
Can you help me to choose best solution? Here is a description of my problem:
We have 1 fms server and many peers (500-1000 and more). Server sends data to all users with high bit rate (1.5mbit h264 live stream). Bandwidth makes it possible to send data only about 500 users but not more than. p2p application multicast should have been a perfect solution, but due to large losses of key frames in the video looks horrible. I have spent more than a day trying to configure it but the result is still not satisfactory - a significant proportion of users have a poor internet connection, awfully configured routers, ADSL, dialup etc. and etc.
So I decided to use data reliability to address the problem. I made an application that cuts the video stream into pieces and sends to all users in real time. Users who, for whatever reason have not received the necessary part at the right time can request it directly from the server ( nc.call("getChunk") )
My application worked fine on a small number of users, but by increasing the number of peers began to appear the problem of packet loss. Manual requests packets from the server of course saves the day, but this again will be limited in the bandwidth of the server.
Then I force clients to send all recieved data again (I tried post() and sendToAllNeighbors()). It completely freed the server but excessive loaded users. They are forced to send and receive much more data than required. Users with poor Internet in general have lost the ability to watch stream. Those who have good internet began to complain about the high flow of traffic. Download speed could reach 10Mbps and even more!
In all cases, I also used object replication, but through it there was only about 10% of the data.
Is it possible to solve the situation programmatically? Or is it easier to buy a second server? I would like to have the most scalable solution as the number of users expected to increase by several times

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