Maximum legal size of ICMP echo packet

StackOverflow https://stackoverflow.com/questions/9449837

  •  13-11-2019
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Question

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

65535 - 20 - 8 = 65507

Thanks.

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Solution

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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