CHAPTER A: PORT AND TYPE REFERENCE PORT AND TYPE REFERENCE
MULTINET4 MULTI-PORT SERIAL SERVER & MANAGED SWITCH – INSTRUCTION MANUAL A–5
A.2 ICMP Types
The Internet Control Message Protocol (ICMP) is a core protocol of the Internet protocol
suite. It is mainly used to send error messages. Unlike TCP and UDP, ICMP is usually not
used by network applications (with the exception of the ping application).
The table below is a list of the ICMP types.
Table A–2: ICMP Types
Port Description
0Echo Reply
1 Unassigned
2 Unassigned
3 Destination Unreachable
4 Source Quench
5Redirect
6 Alternate Host Address
7 Unassigned
8Echo
9Router Advertisement
10 Router Selection
11 Time Exceeded
12 Parameter Problem
13 Timestamp
14 Timestamp Reply
15 Information Request
16 Information Reply
17 Address Mask Request
18 Address Mask Reply
19 Reserved (for Security)
20-29 Reserved (for Robustness Experiment)
30 Traceroute
31 Datagram Conversion Error
32 Mobile Host Redirect
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