According to this problem, in this paper, a new reliable multicast protocol is proposed which integrates packet-level FEC and rate-adaptive technology on the basis of unidirectional satellite link.

针对这一问题，在单向链路卫星组播结构基础上，融合分组级FEC和自适应速率技术，提出了一种新的可靠组播协议，经过理论分析可知，新的协议具有较好的差错控制和拥塞控制能力。

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Each line is prefixed with the protocol level within the packet that was scanned.

对于所扫描的数据包内的所有行，使用协议级别作为前缀。

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Authentication at the packet level allows users to be sure that the packet received came from a particular machine, and that its contents were not altered somewhere along the way.

包级别的认证让用户可以确保收到的包来自于特定的机器，并且它的内容在传输路径上没有被改变。

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The truly paranoid may elect to use the 2.4 kernels' Netfilter4 facility (adding stateful packet filtering) or a commercial application-level proxy gateway.

CNN: Analysis: Linux security

But given what Qwest and Level 3 are spending to build smaller packet-switched businesses, he might easily be forced to accelerate spending at the same time that his margins erode.

FORBES: Grand illusions