协议术语:消息与数据包 [英] Protocol Terminology: Message versus Packet

问题描述

实际上，对于以较高级别协议(例如，高于TCP/IP的协议)在网络上传输的通信，最合适的术语是什么?具体来说，我指的是小的二进制数据单元.

In practice, what is the most appropriate term for the communications transmitted over a network in higher level protocols (those above TCP/IP, for example)? Specifically, I am referring to small, binary units of data.

我在各种客户端/服务器库中都看到了消息"和包"，但是我对社区的共识很感兴趣.

I have seen both "message" and "packet" referred to in various client/server libraries, but I was interested in the community's consensus.

推荐答案

这些绝对是消息. 数据包"是第3层(使用ISO术语)协议单元，例如IP数据包； 数据报"是第1层或第2层单元，例如可能构成IP数据包片段的几个以太网数据报.

These are definitely messages. A "packet" is a layer-3 (in ISO terminology) protocol unit, such as an IP packet; and a "datagram" is a layer-1 or layer-2 unit, such as the several Ethernet datagrams that might make up the fragments of an IP packet.

因此，一条消息可能会拆分为多个数据包，尤其是在使用诸如TCP之类的流协议的情况下，而报文可能会拆分为多个数据报.

So a message might be split across several packets, particularly if you're using a streaming protocol such as TCP, and a packet might be split across several datagrams.

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