绕月探测工程北京中心国际联网系统组播问题研究与解决

Multicast Implementation for BACC International Network Interconnection System for CE-1 Circumlunar Exploration Project

“嫦娥一号”CE-1任务中，北京航天飞行控制中心与欧洲空间操作中心进行了国际合作。在中心与欧空局的联试过程中，对SLE用户端（SUN服务器）通过组广播进行远程控制时，出现了一台服务器收发正常，另一台却无法正常接收的现象。本文对此故障进行了机理研究，通过分析证明，这是一个不同系统间对IGMP协议的兼容问题，并提出了相应的解决方案。

During end-to-end test of international network interconnection between BACC and ESOC for CE-1 mission, a problem was encountered when multicast mode was used to send remote control commands to the SLE User （SUN server）. One SLE User server was able to receive multicast packets while the other was not. This paper analyzes the reason of the problem and it is found that IGMP protocol incompatibility of different versions of operating systems caused the problem. A solution is also given.