本文介绍了如何在Ubuntu 12.04上配置服务器和客户端以实现音视频多播功能。具体步骤包括：设置多播组路由、配置PulseAudio模块以支持实时传输协议(RTP)发送和接收。此外，还提供了监测网络流量和音量的方法。
Operating system: Ubuntu-12.04
[Server/Send configuration]
1: joining the multicast group
Adding following to /etc/init.d/rc.local
route add -net 224.0.0.0 netmask 240.0.0.0 dev eth1
2: config pulseaudio configuration file
Adding following to /etc/pulse/default.pa
load-module module-null-sink sink_name=rtp rate=44100
load-module module-rtp-send source=rtp.monitor rate=44100
set-default-sink rtp
[Client/Receiver]
1: joining the multicast group
Adding following to /etc/init.d/rc.local
route add -net 224.0.0.0 netmask 240.0.0.0 dev eth1
2: config pulseaudio configuration file
Adding following to /etc/pulse/default.pa
load-module module-rtp-recv
[Other useful tip]
1: monitor network traffic in terminal, using bmon
xterm -geometry 80x12 bmon
2: volume meter, using pavumeter
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