Mbone
（重定向自Multicast backbone）
Mbone (short for "multicast backbone") was an experimental backbone for carrying IP multicast traffic on the Internet. It was developed in the early 1990s and required specialized hardware and software. Since the operators of most Internet routers have disabled IP multicast due to concerns regarding bandwidth tracking and billing, the Mbone was created in order to connect multicast-capable networks over the existing Internet infrastructure.