ICMP 回显数据包的最大合法大小 [英] Maximum legal size of ICMP echo packet

问题描述

谁能解释一下为什么ICMP回声数据包的最大合法大小计算如下:

Can someone please explain why maximum legal size of ICMP echo packet is calculated as follows:

65535 - 20 - 8 = 65507

65535 - 20 - 8 = 65507

谢谢.

推荐答案

65535 字节是 IPv4 网络数据包的最大允许大小，而 20 和 8 是 IP 和 ICMP 标头的大小，最多留下 65507 字节用于 ICMP 数据.

65535 bytes is the maximum allowed size of a IPv4 network packet, while 20 and 8 are the sizes of the IP and ICMP headers, which leaves up to 65507 bytes for the ICMP data.

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