Internet Control Message Protocol

For information about Internet Control Message Protocol (ICMP) headers, see the following table.

For the ICMP specification, see RFC792 available at http://⁠www.rfc-editor.org.

Table 1. ICMP message
bits 0–7 bits 8–15 bits 16–23 bits 24 - 31

Type

(8 bits)

Code

(8 bits)

Checksum

(16 bits)

(data . . . )