CODEWITHSUNDEEP
network-programmingicmp
Jake
Jake

Reputation: 16837

Maximum legal size of ICMP echo packet

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

65535 - 20 - 8 = 65507

Thanks.

Upvotes: 5

Views: 19690

Answers (1)

Win32
Win32

Reputation: 1149

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.

Upvotes: 20

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