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
0
Echo Reply
1
Unassigned
2
Unassigned
3
Destination Unreachable
4
Source Quench
5
Redirect
6
Alternate Host Address
7
Unassigned
8
Echo
9
Router 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